A is a marksman who operates alone, in a pair, or with a sniper team, to maintain close visual contact with the enemy and shoot them from concealed positions or distances exceeding their detection capabilities.  They generally have specialized training and use high-precision rifles and optics, and often feed information back to their units or military bases.
In addition to marksmanship and long range shooting, military snipers are trained in a variety of techniques: detection, stalking, and target range estimation methods, camouflage, field craft, infiltration, special reconnaissance and observation, surveillance and target acquisition.
The verb "to snipe" originated in the 1770s among soldiers in British India in reference to shooting snipe, which was considered a challenging target for marksmen. The agent noun "sniper" appears by the 1820s.  The term sniper was first attested in 1824 in the sense of the word "sharpshooter". 
A somewhat older term is "sharp shooter", a calque of 18th-century German Scharfschütze , in use in British newspapers as early as 1801.
According to figures released by the United States Department of Defense, the average number of rounds expended in the Vietnam War to kill one enemy soldier with the M-16 was 50,000. The average number of rounds expended by U.S. military snipers to kill one enemy soldier is 1.3 rounds. According to the United States Army, the average soldier will hit a man-sized target 10 percent of the time at 300 meters using the M16A2 rifle. Graduates of the United States Army Sniper School are expected to achieve 90 percent first-round hits at 600 meters, using the M24 Sniper Weapon System (SWS).   
Generally, a sniper's primary function in modern warfare is to provide detailed reconnaissance from a concealed position and, if necessary, to reduce the enemy's fighting ability by shooting high-value targets (especially officers and other key personnel) and in the process pinning down and demoralizing the enemy. Typical sniper missions include managing intelligence information they gather during reconnaissance and surveillance, target acquisition for air-strikes and artillery, assist employed combat force with fire support and counter-sniper tactics, killing enemy commanders, selecting targets of opportunity, and even destruction of military equipment, which tend to require use of anti-materiel rifles in the larger calibers such as the .50 BMG, like the Barrett M82, McMillan Tac-50, and Denel NTW-20.
Soviet - and Russian-derived military doctrines include squad-level snipers. Snipers have increasingly been demonstrated as useful by US and UK forces in the recent Iraq campaign in a fire support role to cover the movement of infantry, especially in urban areas.
Military snipers from the US, UK, and other countries that adopt their military doctrine are typically deployed in two-man sniper teams consisting of a shooter and spotter. A common practice is for a shooter and a spotter to take turns in order to avoid eye fatigue. In most recent combat operations occurring in large densely populated towns, such as Fallujah, Iraq, two teams would be deployed together to increase their security and effectiveness in an urban environment. A sniper team would be armed with its long range weapon, and a shorter-ranged weapon in case of close contact combat.
The German doctrine of largely independent snipers and emphasis on concealment, developed during the Second World War, has been most influential on modern sniper tactics, and is currently used throughout Western militaries (examples are specialized camouflage clothing, concealment in terrain and emphasis on coup d'œil). 
Sniper rifles are classified as crew-served, as the term is used in the United States military. A sniper team (or sniper cell ) consists of a combination of one or more shooters with force protection elements and support personnel: such as a spotter or a flanker . Within the Table of Organization and Equipment for both the United States Army and the U.S. Marine Corps, the operator of the weapon has an assistant trained to fulfill multiple roles, in addition to being sniper-qualified in the operation of the weapon.
The shooter fires the shot while the spotter assists in observation of targets, atmospheric conditions and handles ancillary tasks as immediate security of their location, communication with other parties; including directing artillery fire and close air support. A flanker's task is to observe areas not immediately visible to the sniper or spotter and assist with the team's perimeter and rear security, therefore flankers are usually armed with an assault rifle or battle rifle. Both spotter and flanker carry additional ammunition and associated equipment.
The spotter detects, observes, and assigns targets and watches for the results of the shot. Using a spotting scope and/or rangefinder, the spotter will also read the wind by using physical indicators and the mirage caused by the heat on the ground. Also, in conjunction with the shooter, the spotter will make calculations for distance, angle shooting ( slant range), mil dot related calculations, correction for atmospheric conditions and leads for moving targets. It is not unusual for the spotter to be equipped with a notepad and a laptop computer specifically for performing these calculations.
Law enforcement applications
Law enforcement snipers, commonly called police snipers, and military snipers differ in many ways, including their areas of operation and tactics. A police sharpshooter is part of a police operation and usually takes part in relatively short missions. Police forces typically deploy such sharpshooters in hostage scenarios. This differs from a military sniper, who operates as part of a larger army, engaged in warfare. Sometimes as part of a SWAT team, police snipers are deployed alongside negotiators and an assault team trained for close quarters combat. As policemen, they are trained to shoot only as a last resort, when there is a direct threat to life; the police sharpshooter has a well-known rule: "Be prepared to take a life to save a life."  Police snipers typically operate at much shorter ranges than military snipers, generally under 100 meters (109 yd) and sometimes even less than 50 meters (55 yd). Both types of snipers do make difficult shots under pressure, and often perform one-shot kills.
Police units that are unequipped for tactical operations may rely on a specialized SWAT team, which may have a dedicated sniper.  Some police sniper operations begin with military assistance.  Police snipers placed in vantage points, such as high buildings, can provide security for events.  In one high-profile incident, Mike Plumb, a SWAT sniper in Columbus, Ohio, prevented a suicide by shooting a revolver out of the individual's hand, leaving him unharmed. 
The need for specialized training for police sharpshooters was made apparent in 1972 during the Munich massacre when the German police could not deploy specialized personnel or equipment during the standoff at the airport in the closing phase of the crisis, and consequently all of the Israeli hostages were killed. While the German army did have snipers in 1972, the use of army snipers in the scenario was impossible due to the German constitution's explicit prohibition of the use of the military in domestic matters. This lack of trained snipers who could be used in civilian roles was later addressed with the founding of the specialized police counter-terrorist unit GSG 9.
Longest recorded sniper kill
The previous record holder was Craig Harrison, a Corporal of Horse (CoH) in the Blues and Royals RHG/D of the British Army. In November 2009, Harrison struck two Taliban machine gunners consecutively south of Musa Qala in Helmand Province in Afghanistan at a range of 2,475 m (2,707 yd) or 1.54 miles using a L115A3 Long Range Rifle.   The QTU Lapua external ballistics software,  using continuous doppler drag coefficient (C d ) data provided by Lapua,  predicts that such shots traveling 2,475 m (2,707 yd) would likely have struck their targets after nearly 6.0 seconds of flight time, having lost 93% of their kinetic energy, retaining 255 m/s (840 ft/s) of their original 936 m/s (3,070 ft/s) velocity, and having dropped 121.39 m (398 ft 3 in) or 2.8° from the original bore line. Due to the extreme distances and travel time involved, even a light cross-breeze of 2.7 m/s (6.0 mph) would have diverted such shots 9.2 m (360 in) off target, which would have required compensation.
The calculation assumes a flat-fire scenario (a situation where the shooting and target positions are at equal elevation), utilizing British military custom high-pressure .338 Lapua Magnum cartridges, loaded with 16.2 g (250 gr) Lapua LockBase B408 bullets, fired at 936 m/s (3,071 ft/s) muzzle velocity  under the following on-site (average) atmospheric conditions: barometric pressure: 1,019 hPa (30.1 inHg) at sea-level equivalent or 899 hPa (26.5 inHg) on-site, humidity: 25.9%, and temperature: 15 °C (59 °F) in the region for November 2009,  resulting in an air density ρ = 1.0854 kg/m 3 at the 1,043 m (3,422 ft) elevation of Musa Qala. Harrison mentions in reports that the environmental conditions were perfect for long range shooting, "... no wind, mild weather, clear visibility."  In a BBC interview, Harrison reported it took about nine shots for him and his spotter to initially range the target successfully. 
Before the development of rifling, firearms were smoothbore and inaccurate over long distance. Barrel rifling was invented at the end of the fifteenth century, but was only employed in large cannons. Over time, rifling, along with other gunnery advances, has increased the performance of modern firearms.
Early forms of sniping, or marksmanship were used during the American Revolutionary War. For instance, in 1777 at the battle of Saratoga the Colonists hid in the trees and used early model rifles to shoot British officers. Most notably, Timothy Murphy shot and killed General Simon Fraser of Balnain on 7 October 1777 at a distance of about 400 yards.    During the Battle of Brandywine, Capt. Patrick Ferguson had a tall, distinguished American officer in his rifle's iron sights. Ferguson did not take the shot, as the officer had his back to Ferguson; only later did Ferguson learn that George Washington had been on the battlefield that day. 
A special unit of marksmen was established during the Napoleonic Wars in the British Army. While most troops at that time used inaccurate smoothbore muskets, the British " Green Jackets " (named for their distinctive green uniforms) used the famous Baker rifle. Through the combination of a leather wad and tight grooves on the inside of the barrel ( rifling), this weapon was far more accurate, though slower to load. These Riflemen were the elite of the British Army, and served at the forefront of any engagement, most often in skirmish formation, scouting out and delaying the enemy. Another term, "sharp shooter" was in use in British newspapers as early as 1801. In the Edinburgh Advertiser , 23 June 1801, can be found the following quote in a piece about the North British Militia; "This Regiment has several Field Pieces, and two companies of Sharp Shooters, which are very necessary in the modern Stile of War". The term appears even earlier, around 1781, in Continental Europe, translated from the German Scharfschütze.
First sniper rifle
The Whitworth rifle was arguably the first long-range sniper rifle in the world.  Designed by Sir Joseph Whitworth, a prominent British engineer, it used polygonal rifling instead, which meant that the projectile did not have to bite into grooves as was done with conventional rifling. His rifle was far more accurate than the Pattern 1853 Enfield, which had shown some weaknesses during the recent Crimean War. At trials in 1857 which tested the accuracy and range of both weapons, Whitworth's design outperformed the Enfield at a rate of about three to one. The Whitworth rifle was capable of hitting the target at a range of 2,000 yards, whereas the Enfield could only manage it at 1,400 yards.
During the Crimean War, the first optical sights were designed to fit onto rifles. Much of this pioneering work was the brainchild of Colonel D. Davidson, using optical sights produced by Chance Brothers of Birmingham. This allowed a marksman to observe and target objects more accurately at a greater distance than ever before.  The telescopic sight, or scope, was originally fixed and could not be adjusted, which therefore limited its range.
Despite its success at the trials, the rifle was not adopted by the British Army. However, the Whitworth Rifle Company was able to sell the weapon to the French army, and also to the Confederacy during the American Civil War. Both the Union and Confederate armies employed sharpshooters. The most notable incident was during the Battle of Spotsylvania Court House, where on 9 May 1864, Union General John Sedgwick was killed at a range of about 1,000 yards (910 meters) after saying the enemy "couldn't hit an elephant at this distance."    
Second Boer War
During the Boer War the latest breech-loading rifled guns with magazines and smokeless powder were used by both sides. The British were equipped with the Lee–Metford rifle, while the Boers had received the latest Mauser rifles from Germany. In the open terrain of South Africa the marksmen were a crucial component to the outcome of the battle.
The first British sniper unit began life as the Lovat Scouts, a Scottish Highland regiment formed in 1899, that earned high praise during the Second Boer War (1899–1902). The unit was formed by Lord Lovat and reported to an American, Major Frederick Russell Burnham, the British Army Chief of Scouts under Lord Roberts. Burnham fittingly described these scouts as "half wolf and half jackrabbit.". Just like their Boer scout opponents, these scouts were well practised in the arts of marksmanship, field craft, map reading, observation, and military tactics.  They were skilled woodsmen and practitioners of discretion: "He who shoots and runs away, lives to shoot another day." They were also the first known military unit to wear a ghillie suit. Hesketh Hesketh-Prichard said of them that "keener men never lived",  and that "Burnham was the greatest scout of our time."  Burnham distinguished himself in wars in South Africa, Rhodesia, and in Arizona fighting the Apaches, and his definitive work, Scouting on Two Continents, provides a dramatic and enlightening picture of what a sniper was at the time and how he operated. 
After the war, this regiment went on to formally become the first official sniper unit, then better known as sharpshooters .
World War I
During World War I, snipers appeared as deadly sharpshooters in the trenches. At the start of the war, only Imperial Germany had troops that were issued scoped sniper rifles. Although sharpshooters existed on all sides, the Germans specially equipped some of their soldiers with scoped rifles that could pick off enemy soldiers showing their heads out of their trench. At first the French and British believed such hits to be coincidental hits, until the German scoped rifles were discovered. During World War I, the German army received a reputation for the deadliness and efficiency of its snipers, partly because of the high-quality lenses that German industry could manufacture.
Soon the British army began to train their own snipers in specialized sniper schools. Major Hesketh Hesketh-Prichard was given formal permission to begin sniper training in 1915, and founded the First Army School of Sniping, Observation, and Scouting at Linghem in France in 1916. Starting with a first class of only six, in time he was able to lecture to large numbers of soldiers from different Allied nations, proudly proclaiming in a letter that his school was turning out snipers at three times the rate of any such other school in the world.
He also devised a metal-armoured double loophole that would protect the sniper observer from enemy fire. The front loophole was fixed, but the rear was housed in a metal shutter sliding in grooves. Only when the two loopholes were lined up—a one-to-twenty chance—could an enemy shoot between them.  Another innovation was the use of a dummy head to find the location of an enemy sniper.  The papier-mâché figures were painted to resemble soldiers to draw sniper fire. Some were equipped with rubber surgical tubing so the dummy could "smoke" a cigarette and thus appear realistic. Holes punched in the dummy by enemy sniper bullets then could be used for triangulation purposes to determine the position of the enemy sniper, who could then be attacked with artillery fire. He developed many of the modern techniques in sniping, including the use of spotting scopes and working in pairs, and using Kim's Game to train observational skills.
The main sniper rifles used during the First World War were the German Mauser Gewehr 98 ; the British Pattern 1914 Enfield  and Lee–Enfield SMLE Mk III, the Canadian Ross Rifle, the American M1903 Springfield, and the Russian M1891 Mosin–Nagant.
World War II
During the interbellum, most nations dropped their specialized sniper units, notably the Germans. Effectiveness and dangers of snipers once again came to the fore during the Spanish Civil War. The only nation that had specially trained sniper units during the 1930s was the Soviet Union. Soviet snipers were trained in their skills as marksmen, in using the terrain to hide themselves from the enemy and the ability to work alongside regular forces. This made the Soviet sniper training focus more on "normal" combat situations than those of other nations.
Snipers reappeared as important factors on the battlefield from the first campaign of World War II. During Germany's 1940 campaigns, it appeared that lone, well-hidden French and British snipers could halt the German advance for a significant amount of time. For example, during the pursuit to Dunkirk, British snipers were able to significantly delay the German infantry's advance. This prompted the British once again to increase training of specialized sniper units. Apart from marksmanship, British snipers were trained to blend in with the environment, often by using special camouflage clothing for concealment. However, because the British Army offered sniper training exclusively to officers and non-commissioned officers, the resulting small number of trained snipers in the combat units considerably reduced their overall effectiveness.
During the Winter War, Finnish snipers took a heavy toll of the invading Soviet army. Simo Häyhä is credited with 505 confirmed kills,   most with the Finnish version of the iron-sighted bolt-action Mosin–Nagant.
One of the best known battles involving snipers, and the battle that made the Germans reinstate their specialized sniper training, was the Battle of Stalingrad. Their defensive position inside a city filled with rubble meant that Soviet snipers were able to inflict significant casualties on the Wehrmacht troops. Because of the nature of fighting in city rubble, snipers were very hard to spot and seriously dented the morale of the German attackers. The best known of these snipers was probably Vasily Zaytsev, featured in the novel War of the Rats and the subsequent film Enemy At The Gates .
German Scharfschützen were prepared before the war, equipped with Karabiner 98 and later Gewehr 43 rifles, but there were often not enough of these weapons available, and as such some were armed with captured scoped Mosin–Nagant 1891/30, SVT or Czech Mauser rifles. The Wehrmacht re-established its sniper training in 1942, drastically increasing the number of snipers per unit with the creation of an additional 31 sniper training companies by 1944. German snipers were at the time the only snipers in the world issued with purpose-manufactured sniping ammunition, known as the 'effect-firing' sS round.  The 'effect-firing' sS round featured an extra carefully measured propellant charge and seated a heavy 12.8 gram (198 gr) full-metal-jacketed boat-tail projectile of match-grade build quality, lacking usual features such as a seating ring to improve the already high ballistic coefficient of .584 (G1) further.  For aiming optics German snipers used the Zeiss Zielvier 4x (ZF39) telescopic sight which had bullet drop compensation in 50 m increments for ranges from 100 m up to 800 m or in some variations from 100 m up to 1000 m or 1200 m. There were ZF42, Zielfernrohr 43 (ZF 4), Zeiss Zielsechs 6x and other telescopic sights by various manufacturers like the Ajack 4x, Hensoldt Dialytan 4x and Kahles Heliavier 4x with similar features employed on German sniper rifles. Several different mountings produced by various manufacturers were used for mounting aiming optics to the rifles. In February 1945 the Zielgerät 1229 active infrared aiming device was issued for night sniping with the StG 44 assault rifle.
A total of 428,335 individuals received Red Army sniper training, including Soviet and non-Soviet partisans, with 9,534 receiving the sniping 'higher qualification'. During World War ІІ, two six-month training courses for women alone trained nearly 55,000 snipers, of which more than two thousand later served in the army.  On average there was at least one sniper in an infantry platoon and one in every reconnaissance platoon, including in tank and even artillery units. Some used the PTRD anti-tank rifle with an adapted scope as an early example of an anti-materiel rifle.
In the United States Armed Forces, sniper training was only very elementary and was mainly concerned with being able to hit targets over long distances. Snipers were required to be able to hit a body over 400 meters away, and a head over 200 meters away. There was almost no instruction in blending into the environment. Sniper training varied from place to place, resulting in wide variation in the qualities of snipers. The main reason the US did not extend sniper training beyond long-range shooting was the limited deployment of US soldiers until the Normandy Invasion. During the campaigns in North Africa and Italy, most fighting occurred in arid and mountainous regions where the potential for concealment was limited, in contrast to Western and Central Europe.
The U.S. Army's lack of familiarity with sniping tactics proved disastrous in Normandy and the campaign in Western Europe where they encountered well trained German snipers. In Normandy, German snipers remained hidden in the dense vegetation and were able to encircle American units, firing at them from all sides. The American and British forces were surprised by how near the German snipers could approach in safety and attack them, as well as by their ability to hit targets at up to 1,000m. A notable mistake made by inexperienced American soldiers was to lie down and wait when targeted by German snipers, allowing the snipers to pick them off one after another. German snipers often infiltrated Allied lines and sometimes when the front-lines moved, they continued to fight from their sniping positions, refusing to surrender until their rations and munitions were exhausted.
Those tactics were also a consequence of changes in German enlistment. After several years of war and heavy losses on the Eastern Front, the German army was forced to rely more heavily on enlisting teenage soldiers. Due to lack of training in more complex group tactics, and thanks to rifle training provided by the Hitlerjugend, those soldiers were often used as autonomous left-behind snipers. While an experienced sniper would take a few lethal shots and retreat to a safer position, those young boys, due both to a disregard for their own safety and to lack of tactical experience would frequently remain in a concealed position and fight until they ran out of ammunition or were killed or wounded. While this tactic generally ended in the demise of the sniper, giving rise to the nickname "Suicide Boys" that was given to those soldiers, this irrational behavior proved quite disruptive to the Allied forces' progress. After World War II, many elements of German sniper training and doctrine were copied by other countries.
In the Pacific War, the Empire of Japan trained snipers. In the jungles of Asia and the Pacific Islands, snipers posed a serious threat to U.S., British, and Commonwealth troops. Japanese snipers were specially trained to use the environment to conceal themselves. Japanese snipers used foliage on their uniforms and dug well-concealed hide-outs that were often connected with small trenches. There was no need for long range accuracy because most combat in the jungle took place within a few hundred meters. Japanese snipers were known for their patience and ability to remain hidden for long periods. They almost never left their carefully camouflaged hiding spots. This meant that whenever a sniper was in the area, the location of the sniper could be determined after the sniper had fired a few shots. The Allies used their own snipers in the Pacific, notably the U.S. Marines, who used M1903 Springfield rifles.
Common sniper rifles used during the Second World War include: the Soviet M1891/30 Mosin–Nagant and, to a lesser extent, the SVT-40 ; the German Mauser Karabiner 98k and Gewehr 43 ; the British Lee–Enfield No. 4 and Pattern 1914 Enfield ; the Japanese Arisaka 97 ; the American M1903A4 Springfield and M1C Garand. The Italians trained few snipers and supplied them with a scoped Carcano Model 1891.
Military sniper training aims to teach a high degree of proficiency in camouflage and concealment, stalking, observation and map reading as well as precision marksmanship under various operational conditions. Trainees typically shoot thousands of rounds over a number of weeks, while learning these core skills.
Snipers are trained to squeeze the trigger straight back with the ball of their finger, to avoid jerking the gun sideways. The most accurate position is prone, with a sandbag supporting the stock, and the stock's cheek-piece against the cheek. In the field, a bipod can be used instead. Sometimes a sling is wrapped around the weak arm (or both) to reduce stock movement. Some doctrines train a sniper to breathe deeply before shooting, then hold their lungs empty while they line up and take their shot. Some go further, teaching their snipers to shoot between heartbeats to minimize barrel motion.
The key to sniping is accuracy, which applies to both the weapon and the shooter. The weapon should be able to consistently place shots within tight tolerances. The sniper in turn must utilize the weapon to accurately place shots under varying conditions.
A sniper must have the ability to accurately estimate the various factors that influence a bullet's trajectory and point of impact such as: range to the target, wind direction, wind velocity, altitude and elevation of the sniper and the target and ambient temperature. Mistakes in estimation compound over distance and can decrease lethality or cause a shot to miss completely.
Snipers zero their weapons at a target range or in the field. This is the process of adjusting the scope so that the bullet's points-of-impact is at the point-of-aim (centre of scope or scope's cross-hairs) for a specific distance. A rifle and scope should retain its zero as long as possible under all conditions to reduce the need to re-zero during missions.
A sandbag can serve as a useful platform for shooting a sniper rifle, although any soft surface such as a rucksack will steady a rifle and contribute to consistency. In particular, bipods help when firing from a prone position, and enable the firing position to be sustained for an extended period of time. Many police and military sniper rifles come equipped with an adjustable bipod. Makeshift bipods known as shooting sticks can be constructed from items such as tree branches or ski poles.
Range and accuracy vary depending on the cartridge and specific ammunition types that are used. Typical ranges for common battle field cartridges are as follows:
|Cartridge||Maximum effective range |
|5.56×45mm NATO ( .223 Remington)||300–500 m|
|7.62×51mm ( .308 Winchester)||800-1,000 m|
|7 mm Remington Magnum||900-1,100 m|
|.300 Winchester Magnum||900-1,200 m|
|.338 Lapua Magnum||1,300-1,600 m|
|.50 BMG ( 12.7×99mm NATO)||1,500-2,000 m|
|12.7×108mm (Russian)||1,500-2,000 m|
|14.5×114mm (Russian)||1,900-2,300 m|
Servicemen volunteer for the rigorous sniper training and are accepted on the basis of their aptitude, physical ability, marksmanship, patience and mental stability. Military snipers may be further trained as forward air controllers (FACs) to direct air strikes or forward observers (FOs) to direct artillery or mortar fire. 
From 2011, the Russian armed forces has run newly developed sniper courses in military district training centres. In place of the Soviet practice of mainly squad sharpshooters, which were often designated during initial training (and of whom only few become snipers per se ), "new" Army snipers are to be trained intensively for 3 months (for conscripts) or longer (for contract soldiers). The training program includes theory and practice of countersniper engagements, artillery spotting and coordination of air support. The first instructors are the graduates of the Solnechnogorsk sniper training centre.
The method of sniper deployment, according to the Ministry of Defence, is likely to be one three-platoon company at the brigade level, with one of the platoons acting independently and the other two supporting the battalions as needed. 
Targeting, tactics and techniques
The range to the target is measured or estimated as precisely as conditions permit and correct range estimation becomes absolutely critical at long ranges, because a bullet travels with a curved trajectory and the sniper must compensate for this by aiming higher at longer distances. If the exact distance is not known the sniper may compensate incorrectly and the bullet path may be too high or low. As an example, for a typical military sniping cartridge such as 7.62×51mm NATO (.308 Winchester) M118 Special Ball round this difference (or “drop”) from 700 to 800 meters (770–870 yd) is 200 millimetres (7.9 in). This means that if the sniper incorrectly estimated the distance as 700 meters when the target was in fact 800 meters away, the bullet will be 200 millimeters lower than expected by the time it reaches the target.
Laser rangefinders may be used, and range estimation is often the job of both parties in a team. One useful method of range finding without a laser rangefinder is comparing the height of the target (or nearby objects) to their size on the mil dot scope, or taking a known distance and using some sort of measure (utility poles, fence posts) to determine the additional distance. The average human head is 150 millimeters (5.9 in) in width, average human shoulders are 500 millimeters (20 in) apart and the average distance from a person's pelvis to the top of their head is 1,000 millimeters (39 in).
To determine the range to a target without a laser rangefinder, the sniper may use the mil dot reticle on a scope to accurately find the range. Mil dots are used like a slide rule to measure the height of a target, and if the height is known, the range can be as well. The height of the target (in yards) ×1000, divided by the height of the target (in mils), gives the range in yards. This is only in general, however, as both scope magnification (7×, 40×) and mil dot spacing change. The USMC standard is that 1 mil (that is, 1 milliradian) equals 3.438 MOA ( minute of arc, or, equivalently, minute of angle), while the US Army standard is 3.6 MOA, chosen so as to give a diameter of 1 yard at a distance of 1,000 yards (or equivalently, a diameter of 1 meter at a range of 1 kilometer.) Many commercial manufacturers use 3.5, splitting the difference, since it is easier to work with.
At longer ranges, bullet drop plays a significant role in targeting. The effect can be estimated from a chart, which may be memorized or taped to the rifle, although some scopes come with Bullet Drop Compensator (BDC) systems that only require the range be dialed in. These are tuned to both a specific class of rifle and specific ammunition. Every bullet type and load will have different ballistics. .308 Federal 175 grain (11.3 g) BTHP match shoots at 2,600 ft/s (790 m/s). Zeroed at 100 yards (100 m), a 16.2 MOA adjustment would have to be made to hit a target at 600 yards (500 m). If the same bullet was shot with 168 grain (10.9 g), a 17.1 MOA adjustment would be necessary.
Shooting uphill or downhill is confusing for many because gravity does not act perpendicular to the direction the bullet is traveling. Thus, gravity must be divided into its component vectors. Only the fraction of gravity equal to the cosine of the angle of fire with respect to the horizon affects the rate of fall of the bullet, with the remainder adding or subtracting negligible velocity to the bullet along its trajectory. To find the correct zero, the sniper multiplies the actual distance to the range by this fraction and aims as if the target were that distance away. For example, a sniper who observes a target 500 meters away at a 45-degree angle downhill would multiply the range by the cosine of 45 degrees, which is 0.707. The resulting distance will be 353 meters. This number is equal to the horizontal distance to the target. All other values, such as windage, time-to-target, impact velocity, and energy will be calculated based on the actual range of 500 meters. Recently, a small device known as a cosine indicator has been developed. This device is clamped to the tubular body of the telescopic sight, and gives an indicative readout in numerical form as the rifle is aimed up or down at the target. This is translated into a figure used to compute the horizontal range to the target.
Windage plays a significant role, with the effect increasing with wind speed or the distance of the shot. The slant of visible convections near the ground can be used to estimate crosswinds, and correct the point of aim. All adjustments for range, wind, and elevation can be performed by aiming off the target, called "holding over" or Kentucky windage. Alternatively, the scope can be adjusted so that the point of aim is changed to compensate for these factors, sometimes referred to as "dialing in". The shooter must remember to return the scope to zeroed position. Adjusting the scope allows for more accurate shots, because the cross-hairs can be aligned with the target more accurately, but the sniper must know exactly what differences the changes will have on the point-of-impact at each target range.
For moving targets, the point-of-aim is ahead of the target in the direction of movement. Known as "leading" the target, the amount of "lead" depends on the speed and angle of the target's movement as well as the distance to the target. For this technique, holding over is the preferred method. Anticipating the behavior of the target is necessary to accurately place the shot.
Hide sites and hiding techniques
The term "hide site" refers to a covered and concealed position from which a sniper and his team can conduct surveillance and/or fire at targets. A good hide conceals and camouflages the sniper effectively, provides cover from enemy fire and allows a wide view of the surrounding area.
The main purpose of ghillie suits and hide sites is to break up the outline of a person with a rifle.
Many snipers use ghillie suits to hide and stay hidden. Ghillie suits vary according to the terrain into which the sniper wishes to blend. For example, in dry, grassy wasteland the sniper will typically wear a ghillie suit covered in dead grass.
Shot placement, which is where on the body the sniper is aiming, varies with the type of sniper. Military snipers, who generally do not shoot at targets at less than 300 m (330 yd), usually attempt body shots, aiming at the chest. These shots depend on tissue damage, organ trauma, and blood loss to kill the soldier. Body shots are used because the chest is a larger target.
Police snipers, who generally shoot at much shorter distances, may attempt more precise shot at particular parts of body or particular devices: in one incident in 2007 in Marseille, a GIPN sniper took a shot from 80 m (87 yd) at the pistol of a police officer threatening to commit suicide, destroying the weapon and preventing the police officer from killing himself. 
In a high-risk or hostage-taking situation where a suspect is imminently threatening to kill a hostage, police snipers may take head shots to ensure an instant kill. The snipers aim for the "apricot", or the medulla oblongata, located inside the head, a part of the brain that controls involuntary movement that lies at the base of the skull.
Snipers are trained for the detection, identification, and location of a targeted soldier in sufficient detail to permit the effective employment of lethal and non-lethal means. Since most kills in modern warfare are by crew-served weapons, reconnaissance is one of the most effective uses of snipers. They use their aerobic conditioning, infiltration skills and excellent long-distance observation equipment (optical scopes) and tactics to approach and observe the enemy. In this role, their rules of engagement typically let them shoot at high-value targets of opportunity, such as enemy officers.
The targets may be personnel or high-value materiel (military equipment and weapons) but most often they target the most important enemy personnel such as officers or specialists (e.g. communications operators) so as to cause maximum disruption to enemy operations. Other personnel they might target include those who pose an immediate threat to the sniper, like dog handlers, who are often employed in a search for snipers. A sniper identifies officers by their appearance and behavior such as symbols of rank, talking to radio operators, sitting as a passenger in a car, sitting in a car with a large radio antenna, having military servants, binoculars/map cases or talking and moving position more frequently. If possible, snipers shoot in descending order by rank, or if rank is unavailable, they shoot to disrupt communications.
Some rifles, such as the Denel NTW-20 and Vidhwansak, are designed for a purely anti-materiel (AM) role, e.g. shooting turbine disks of parked aircraft, missile guidance packages, expensive optics, and the bearings, tubes or wave guides of radar sets. A sniper equipped with the correct rifle can target radar dishes, water containers, the engines of vehicles, and any number of other targets. Other rifles, such as the .50 caliber rifles produced by Barrett and McMillan, are not designed exclusively as AM rifles, but are often employed in such a way, providing the range and power needed for AM applications in a lightweight package compared to most traditional AM rifles. Other calibers, such as the .408 Cheyenne Tactical and the .338 Lapua Magnum, are designed to be capable of limited AM application, but are ideally suited as long range anti-personnel rounds.
Often in situations with multiple targets, snipers use relocation. After firing a few shots from a certain position, snipers move unseen to another location before the enemy can determine where they are and mount a counter-attack. Snipers will frequently use this tactic to their advantage, creating an atmosphere of chaos and confusion. In other, rarer situations, relocation is used to eliminate the factor of wind.
As sniper rifles are often extremely powerful and consequently loud, it is common for snipers to use a technique known as sound masking. When employed by a highly skilled marksman, this tactic can be used as a substitute for a noise suppressor. Very loud sounds in the environment, such as artillery shells air bursting or claps of thunder, can often mask the sound of the shot. This technique is frequently used in clandestine operations, infiltration tactics, and guerrilla warfare.
Due to the surprise nature of sniper fire, high lethality of aimed shots and frustration at the inability to locate and counterattack snipers, sniper tactics have a significant negative effect on morale. Extensive use of sniper tactics can be used to induce constant stress and fear in opposing forces, making them afraid to move about or leave cover. In many ways, the psychological impact imposed by snipers is quite similar to those of landmines, booby-traps, and IEDs (constant threat, high "per event" lethality, inability to strike back).   
Historically, captured snipers are often summarily executed. This happened during World War I,  and World War II, for example the second Biscari Massacre when 36 suspected snipers were lined up and shot on 14 July 1943.
As a result, if a sniper is in imminent danger of capture, he may discard any items (sniper rifle, laser rangefinder, etc.) which might indicate his status as a sniper. The risk of captured snipers being summarily executed is explicitly referred to in Chapter 6 of US Army doctrine document FM 3-060.11 entitled "SNIPER AND COUNTERSNIPER TACTICS, TECHNIQUES, AND PROCEDURES":
Historically, units that suffered heavy and continual casualties from urban sniper fire and were frustrated by their inability to strike back effectively often have become enraged. Such units may overreact and violate the laws of land warfare concerning the treatment of captured snipers. This tendency is magnified if the unit has been under the intense stress of urban combat for an extended time. It is vital that commanders and leaders at all levels understand the law of land warfare and understand the psychological pressures of urban warfare. It requires strong leadership and great moral strength to prevent soldiers from releasing their anger and frustration on captured snipers or civilians suspected of sniping at them. 
The negative reputation and perception of snipers can be traced back to the American Revolution, when American "Marksmen" intentionally targeted British officers, an act considered uncivilized by the British Army at the time (this reputation was cemented during the Battle of Saratoga, when Benedict Arnold allegedly ordered his marksmen to target British General Simon Fraser, an act that won the battle and French support). The British side used specially selected sharpshooters as well, often German mercenaries.
To demoralize enemy troops, snipers can follow predictable patterns. During the 26th of July Movement in the Cuban Revolution, the revolutionaries led by Fidel Castro always killed the foremost man in a group of President Batista's soldiers. Realizing this, none of Batista's men would walk first, as it was suicidal. This effectively decreased the army's willingness to search for rebel bases in the mountains. An alternative approach to this psychological process is to kill the second man in the row, leading to the psychological effect of nobody wanting to follow the "leader".
The occurrence of sniper warfare has led to the evolution of many counter-sniper tactics in modern military strategies. These aim to reduce the damage caused by a sniper to an army, which can often be harmful to both combat capabilities and morale.
The risk of damage to a chain of command can be reduced by removing or concealing features that would otherwise indicate an officer's rank. Modern armies tend to avoid saluting officers in the field, and eliminate rank insignia on battle dress uniforms (BDU). Officers can seek maximum cover before revealing themselves as good candidates for elimination through actions such as reading maps or using radios.
Friendly snipers can be used to hunt the enemy sniper. Besides direct observation, defending forces can use other techniques. These include calculating the trajectory of a bullet by triangulation. Traditionally, triangulation of a sniper's position was done manually, though radar-based technology has recently become available. Once located, the defenders can attempt to approach the sniper from cover and overwhelm them. The United States military is funding a project known as RedOwl (Robot Enhanced Detection Outpost With Lasers), which uses laser and acoustic sensors to determine the exact direction from which a sniper round has been fired. 
The more rounds fired by a sniper, the greater the chance the target has of locating him. Thus, attempts to draw fire are often made, sometimes by offering a helmet slightly out of concealment, a tactic successfully employed in the Winter War by the Finns known as "Kylmä-Kalle" (Cold Charlie).  They used a shop mannequin or other doll dressed as a tempting target, such as an officer. The doll was then presented as if it were a real man sloppily covering himself. Usually, Soviet snipers were unable to resist the temptation of an apparently easy kill. Once the angle where the bullet came from was determined, a large caliber gun, such as a Lahti L-39 "Norsupyssy" ("Elephant rifle") anti-tank rifle was fired at the sniper to kill him.
Other tactics include directing artillery or mortar fire onto suspected sniper positions, the use of smoke screens, placing tripwire -operated munitions, mines, or other booby-traps near suspected sniper positions. Even dummy trip-wires can be placed to hamper sniper movement. If anti-personnel mines are unavailable, it is possible to improvise booby-traps by connecting trip-wires to hand grenades, smoke grenades or flares. Though these may not kill a sniper, they will reveal their location. Booby-trap devices can be placed near likely sniper hides, or along the probable routes to and from positions. Knowledge of sniper field-craft will assist in this task.
One very old counter-sniper tactic is to tie rags onto bushes or similar items in suspected sniper hides. These rags flutter in the breeze creating movements in the corner of the sniper's eye, which they will often find distracting. The greatest virtue of this tactic is its simplicity and ease of implementation; however, it is unlikely to prevent a skilled sniper from selecting targets, and may in fact provide a sniper with additional information about the wind near the target.
Irregular and asymmetric warfare
The use of sniping (in the sense of shooting at relatively long range from a concealed position) to murder came to public attention in a number of sensational U.S. criminal cases, including the Austin sniper incident of 1966 (Charles Whitman), the John F. Kennedy assassination (Lee Harvey Oswald), and the Beltway sniper attacks of late 2002 (Lee Boyd Malvo). However, these incidents usually do not involve the range or skill of military snipers; in all three cases the perpetrators had U.S. military training, but in other specialties. News reports will often (inaccurately) use the term sniper to describe anyone shooting with a rifle at another person. 
Sniping has been used in asymmetric warfare situations, for example in the Northern Ireland Troubles, where in 1972, the bloodiest year of the conflict, the majority of the soldiers killed were shot by concealed IRA riflemen. There were some instances in the early 1990s of British soldiers and RUC personnel being shot with .50 caliber Barrett rifles by sniper teams collectively known as the South Armagh sniper. 
The sniper is particularly suited to combat environments where one side is at a disadvantage. A careful sniping strategy can use a few individuals and resources to thwart the movement or other progress of a much better equipped or larger force. Sniping enables a few persons to instil terror in a much larger regular force — regardless of the size of the force the snipers are attached to. It is widely accepted that sniping, while effective in specific instances, is much more effective as a broadly deployed psychological attack or as a force-multiplier.   
Snipers are less likely to be treated mercifully than non-snipers if captured by the enemy. The rationale for this is that ordinary soldiers shoot at each other at 'equal opportunity' whilst snipers take their time in tracking and killing individual targets in a methodical fashion with a relatively low risk of retaliation.
War in Iraq
In 2003, the U.S.-led multinational coalition composed of primarily U.S. and U.K. troops occupied Iraq and attempted to establish a new government in the country. However, shortly after the initial invasion, violence against coalition forces and among various sectarian groups led to asymmetric warfare with the Iraqi insurgency and civil war between many Sunni and Shia Iraqis.
Through November 2005, when the Pentagon had last reported a sniper fatality, the Army had attributed 28 of 2,100 U.S. deaths to enemy snipers. More recently, since 2006, insurgent snipers such as " Juba " have caused problems for American troops. Claims have been made that Juba have shot up to 37 American soldiers in Iraq as of October 2006. 
In 2006, training materials obtained by U.S. intelligence showed that snipers fighting in Iraq were urged to single out and attack engineers, medics, and chaplains on the theory that those casualties would demoralize entire enemy units.  Among the training materials, there included an insurgent sniper training manual that was posted on the Internet. Among its tips for shooting U.S. troops, there read: "Killing doctors and chaplains is suggested as a means of psychological warfare."
Some sniper teams in Afghanistan have killed large numbers of Taliban in quite short periods of time. For example, while in Helmand Province, two British snipers (part of the Welsh Guards Battle group) shot dead a total of 75 Taliban in only 40 days during the summer of 2009. In one session of duty, lasting just two hours, they shot and killed eight Taliban. On another occasion, the same team scored a "Quigley" (i.e., killing two Taliban with a single bullet) at a range of 196 metres. 
Taliban snipers have themselves caused problems for coalition forces. For example, over a four-month period in early 2011, two Taliban snipers shot dead two British soldiers and wounded six others at an outpost in Qadrat, Helmand province.  In one unusual incident, an unnamed 55-year-old ex-Mujahideen fighter with a motorbike and an old British-made Enfield rifle killed two British soldiers with a single shot, hitting the first in the head and the second in the neck. 
Sniper activity has been reported during the Arab Spring civil unrest in Libya in 2011, both from anti-governmental and pro-governmental  supporters, and in Syria at least from pro-government  forces.
Notable military marksmen and snipers
- Lord Brooke, who represented the Parliamentarians in the English Civil War, was the first recorded British sniper victim, killed by a Royalist soldier hiding in a bell tower in Lichfield.
- Timothy Murphy ( American Revolutionary War) – killed British General Simon Fraser during the pivotal Battle of Saratoga, hampering the British advance which helped cause them to lose the battle.
- Patrick Ferguson ( American Revolutionary War) - developer of the world's first breech-loaded military rifle (which advanced sniping and sharpshooting tactics), fought with his Corps of Riflemen (recruited from the 6th and 14th Foot) at the Battle of Brandywine, where he may have passed up a chance to shoot George Washington.
- Napoleonic Wars – Use of Marine sharpshooters in the mast tops was common usage in navies of the period, and Admiral Nelson's death at Trafalgar is attributed to the actions of French sharpshooters. The British Army developed the concept of directed fire (as opposed to massive unaimed volleys) and formed Rifle regiments, notably the 95th and the 60th who wore green jackets instead of the usual redcoats. Fighting as Skirmishers, usually in pairs and trusted to choose their own targets, they wrought havoc amongst the French during the Peninsular War.
- British Rifleman Thomas Plunkett (Peninsular war) – shot French General Colbert and one of his aides at a range of between 200 and 600 metres (219 and 656 yd) using a Baker rifle. 
- Colonel Hiram Berdan ( American Civil War) – commanded 1st and 2nd US Sharpshooters, who were trained and equipped Union marksmen with the .52 caliber Sharps Rifle. It has been claimed that Berdan's units killed more enemies than any other in the Union Army.
- Jack Hinson ( American Civil War) recorded 36 "kills" on his custom-made .50 caliber Kentucky long rifle with iron sights. 
- During the American Civil War, an unidentified Confederate sniper shot Major General John Sedgwick during the Battle of Spotsylvania Court House probably with a British Whitworth target rifle at the then-incredible distance of minimum 730 metres (798 yd). Ben Powell of the 12th South Carolina claimed credit, although his account has been discounted because the general he shot at with a Whitworth rifled musket was mounted, probably Brig Gen. William H. Morris. Union troops from the 6th Vermont claim to have shot an unidentified sharpshooter as they crossed the fields seeking revenge. The shooting of Sedgewick caused administrative delays in the Union's attack and led to Confederate victory. Sedgwick ignored advice to take cover, his last words according to urban legend being, "They couldn't hit an elephant at this dist-", whereupon he was shot. In reality, he was shot a few minutes later.
- Major Frederick Russell Burnham - assassinated Mlimo, the Ndebele religious leader, in his cave in Matobo Hills, Rhodesia, effectively ending the Second Matabele War (1896).  Burnham started as a cowboy and Indian tracker in the American Old West, but he left the United States to scout in Africa and went on to command the British Army Scouts in the Second Boer War. For his ability to track, even at night, the Africans dubbed him, He-who-sees-in-the-dark , but in the press he became more widely known as England's American Scout . 
- Billy Sing ( World War I) – An Australian sniper with at least 150 confirmed kills during the Gallipoli Campaign ; he may have had close to 300 kills in total at Gallipoli, and went on to fight at the Western Front.
- Francis Pegahmagabow ( World War I) – Native Canadian sniper credited with 378 kills, and an unknown number of unconfirmed kills. He only took credit for kills when they were verified by an officer. 
- Alvin York, ( World War I)
- Finnish Lance Corporal Simo Häyhä, aka "White Death", was a sniper during the Winter War and is regarded by many as the most effective sniper in the history of warfare, being credited with killing up to 705 (505 sniper kills, and estimated 200 sub-machine gun kills) Soviet soldiers accomplished in fewer than 100 days. Häyhä used a White Guard M/28 "Pystykorva" or "Spitz", variant of the Russian Mosin–Nagant rifle, and iron sights. 
- Mihail Ilyich Surkov has been said to have killed 702 enemy troops, Vladimir Gavrilovich Salbiev with 601 confirmed kills, Vasilij Kvachantiradze with 534 and Ivan Sidorenko with ~500. 
- Lieutenant Lyudmila Pavlichenko (World War II) – female Soviet sniper with 309 confirmed kills, making her the most successful female sniper in history.
- Junior Lieutenant Vasily Zaytsev ( World War II) – credited with killing about 200 German soldiers during the Battle of Stalingrad,  he is portrayed in the film Enemy at the Gates and in the book War of the Rats ; both are fictionalized accounts.
- Semen Nomokonov killed 367 persons, including a general. 
- Gefreiter (Private) Matthäus Hetzenauer (World War II) – Austrian sniper who was credited with 345 confirmed kills  on the Eastern Front, the most successful in the Wehrmacht.
- Obergefreiter (Private First Class) Josef 'Sepp' Allerberger (World War II) – Austrian sniper credited with 257 confirmed kills on the Eastern Front.  (the same situation as has Hetzenauer – German officers seldom confirmed kills).
- Klavdiya Kalugina - Soviet sniper in the Second World War, entered active service at age 17 in March 1944, fighting on the 3rd Belorussian Front as one of the youngest women snipers. She has 257 confirmed kills.
- Helmut Wirnsberger – German sniper, who has served in 3. Gebirgsjaegerdivision during WW II and credited 64 confirmed kills. 
- Chinese Sergeant Tung Chih Yeh claimed to have shot and killed over 100 Imperial Japanese Army (IJA) soldiers using a Chiang Kai-Shek rifle in around Yangtze during the Second Sino-Japanese War. 
- Zhang Taofang (Chinese: 张桃芳; Traditional Chinese: 張桃芳; Wade–Giles: Zhang Tao-fang) was a Chinese soldier during the Korean War. He is credited with 214 confirmed kills in 32 days without using a sniper magnifying scope.
- Clive Hulme was a New Zealand recipient of the Victoria Cross, the highest and most prestigious award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces. He is credited with stalking and killing 33 German snipers in the Battle of Crete. 
- Ian Robertson served as a sniper with Australia's 3RAR post World War 2. He became one of the most effective snipers during the Korean War where in one instance he killed 30 enemies in a single morning. 
- Roza Shanina - Soviet sniper during World War II, credited with 59 confirmed kills, including twelve soldiers during the Battle of Vilnius.
- Gunnery Sergeant Carlos Hathcock ( Vietnam War) – achieved 93 confirmed kills but believed to have over 200 unconfirmed kills. With a telescopic-scoped .50 caliber M2 Browning heavy machine gun, he set a world record for the longest recorded sniper kill at 2,286 m (2,500 yd) which stood for 35 years until 2002.   
- Chuck Mawhinney ( Vietnam War) – 103 confirmed and 216 probable kills. 
- Adelbert F. Waldron, III ( Vietnam War) – achieved 109 confirmed kills. 
- Master Sgt. Gary Gordon and Sgt. First Class Randy Shughart ( Somalia: Operation Gothic Serpent ) – were Delta Force snipers who were awarded the Medal of Honor for their fatal attempt to protect the injured crew of a downed helicopter during the Battle of Mogadishu. This action was later dramatized in the film Black Hawk Down .
- British Army CoH Craig Harrison of the Household Cavalry successfully engaged two Taliban machine gunners south of Musa Qala in Helmand Province in Afghanistan in November 2009 at a range of 2,475 m (2,707 yd), using a L115A3 Long Range Rifle rifle chambered in .338 Lapua Magnum. These were the longest recorded and confirmed sniper kills in history.
- Canadian Corporal Rob Furlong, formerly of the PPCLI ( Operation Anaconda, Afghanistan) - achieved a recorded and confirmed sniper kill at 2,430 m (2,657 yd) in 2002 using a .50 caliber (12.7 mm) McMillan TAC-50 rifle. 
- Canadian Master Corporal Arron Perry, formerly of the PPCLI ( Operation Anaconda, Afghanistan) - briefly held the record for the longest-ever recorded and confirmed sniper kill at 2,310 m (2,526 yd) in 2002 after eclipsing US Marine Gunnery Sergeant Carlos Hathcock's previous record established in 1967. Perry used a .50 caliber (12.7 mm) McMillan TAC-50 rifle. 
- U.S. Navy Chief Chris Kyle of SEAL Team Three, during four deployments to Iraq between 2003 and 2009, had 255 kills, 160 of which are officially confirmed by the Pentagon. With the force of the official confirmation, and in popular mythology that he be the holder of a title, the figure takes Kyle to being the deadliest marksman in US military history. During the Second Battle of Fallujah alone, when US Marines fought running battles in the streets with several thousand insurgents, he killed 40 enemy personnel. For his deadly record as a marksman during his deployment to Ramadi, the insurgents named him 'Al-Shaitan Ramad' - the Devil of Rahmadi - and put a $20,000 bounty on his head. His most feted shot came outside Sadr City in 2008 when he shot an insurgent with a rocket launcher near an Army convoy with his .338 Lapua Magnum rifle at 1,920 m (2,100 yd).  Kyle was honorably discharged in 2009, and on February 2, 2013, was murdered at a shooting range along with another victim in Texas by a Marine veteran suffering from PTSD. Subject of the movie American Sniper .
- British Army Corporal Christopher Reynolds of the 3rd. battalion the Royal Regiment of Scotland, the Black Watch, shot and killed a Taliban commander at a range of 1,853 m (2,026 yd) using a .338 Lapua Magnum (8.6 mm) L115A3 rifle. 
- U.S. Marine Corps Staff Sergeant Steve Reichert - Killed an Iraqi insurgent and possibly injuring two more hiding behind a brick wall with a shot from 1 mile in Lutayfiyah, Iraq on 9 April 2004. Reichert was using a Barrett M82A3.50BMG rifle loaded with Raufoss Mk 211 multipurpose rounds. During the same engagement Reichert eliminated an Iraqi machine gunner pinning down a squad of Marines from a distance of 1,614 m (1,765 yd). 
- U.S. Army Staff Sergeant Jim Gilliland - Previously held the record for the longest recorded confirmed kill with a 7.62×51mm NATO rifle at 1,250 m (1,367 yd) with a M24, while engaging an Iraqi insurgent sniper in Ramadi, Iraq on 27 September 2005. 
- U.S. Army Staff Sergeant Timothy L. Kellner - regarded as one of the top snipers still active in the U.S. Army, with 78 confirmed kills during the Iraq War and 3 in Haiti. 
- Canadian Master Corporal Graham Ragsdale using a .308 registered 20 confirmed kills over ten days during Operation Anaconda.
- Sri Lankan Army Sniper, Corporal I.R. Premasiri alias ‘Nero’, of the 5th Battalion in the Gajaba Regiment has 180 confirmed L.T.T.E. terrorist kills. 
- Iraqi insurgent Juba, a sniper who features in several propaganda videos. Juba has allegedly shot 37 American soldiers, although whether Juba is a real individual is unknown. He may be a constructed composite of a number of insurgent snipers. 
- Corporal Ben Roberts-Smith VC MG of the Australian Special Air Service Regiment was awarded the Medal of Gallantry for his actions in 2006 during Operation Perth in the Chora Valley of Oruzgan Province, Afghanistan. In that action, patrol sniper Roberts-Smith prevented an outnumbered patrol from being overrun by Anti-Coalition Militia with sniper fire.  Subsequently, in early 2011, he became the second Australian to be awarded the Victoria Cross on Operation Slipper in Afghanistan. During the Shah Wali Kot Offensive in June 2010, having provided sniper over-watch for ground forces from a helicopter with a M14 EBR rifle, Roberts-Smith was placed into a firefight by helicopter and subsequently eliminated machine gun positions. 
- U.S. Army Staff Sergeant Justin Morales - As part of the U.S. Army CIST (Counter Insurgent Sniper Team) in Iraq, he recorded 27 confirmed kills with a M24 7.62×51mm NATO rifle. From 2005 to 2006, Morales and his team in Balad, Iraq was tasked with seeking out insurgents placing IEDs along Main Supply Routes and Alternate Supply Routes. 
- U.S. Army SPC Christopher Dale Abbott- As part of a U.S. Army Counter IED team (CIEDT) in Iraq in 2007-2008, he recorded 22 confirmed kills with a M24 7.62×51mm NATO rifle for a period of only 7 months before being injured and sent out of theater. Being a Military Police Officer attached to assist the 25th Infantry Division out of Hawaii, he and his team were tasked with seeking out insurgents placing IEDs (Improvised Explosive Devices) along frequently used supply routes. 
- During May 2017, in Iraq a Canadian Armed Forces Joint Task Force 2 sniper using a McMillan Tac-50 sniper rifle set a new world record for the longest confirmed kill shot at a distance of 3,540 m (3,871 yd). The shot was fired from a high-rise building and the bullet travelled for "under 10 seconds" before hitting the target, an ISIS insurgent.
- Jäger (military)
- List of snipers
- List of sniper rifles
- Longest recorded sniper kills
- Operation Foxley - plan to kill Adolf Hitler using a sniper
- Sniper Alley
- Snipers of the Soviet Union
- Special forces
- South Armagh Sniper (1990–97)
- . Shooting Range Industries . 2017-07-31 . Retrieved 2017-11-23 .
- . Online Etymology Dictionary . Retrieved 1 April 2011 .
- In the Edinburgh Advertiser , 23 June 1801, can be found the following quote in a piece about the North British Militia; "This Regiment has several Field Pieces, and two companies of Sharp Shooters, which are very necessary in the modern Stile of War" .
- , p. 316
- Freigegeben ab 12 Jahren (2 January 2008). "Snipers during the First and Second World Wars": info taken from: Zeitgeschichte - Spezialeinheiten im Zweiten Weltkrieg: Scharfschützen (Documentary film) (in German). EMS GmbH. Event occurs at 57mins. EAN: 4020974153959.
- . CBS News. 25 January 2001 . Retrieved 4 May 2008 .
- . Archived from on 22 July 2012 . Retrieved 4 May 2008 .
- . Australian Broadcasting Corporation. 6 September 2007 . Retrieved 4 May 2008 .
- Scanlon, James J. (2010). . The Columbus Ohio Police. Archived from on 6 December 2003 . Retrieved 7 May 2010 . -
- Fife, Robert (21 June 2017). . The Globe and Mail . Retrieved 22 June 2017 .
- Smith, Michael (2 May 2010) "". The Sunday Times . (subscription required)
- Arnold, Adam (3 May 2010). . Sky News . Sky UK. Archived from on 14 May 2015 . Retrieved 7 June 2015 .
Conditions were perfect, no wind, mild weather, clear visibility.
- . Web.archive.org. 29 June 2009. Archived from on 29 June 2009 . Retrieved 1 April 2013 .
- . Mod.uk. 20 February 2007. Archived from on 7 June 2011 . Retrieved 1 June 2011 .
- . Wunderground.com. 21 May 2011 . Retrieved 1 June 2011 .
- . accurateshooter.com. 3 May 2010 . Retrieved 7 June 2015 .
- Gregory Mast; Hans Halberstadt (January 2007). . Zenith Imprint. p. 18. ISBN 978-0-7603-3002-9 . Retrieved 12 July 2013 .
- Alexander Rose (21 October 2008). . New York: Random House Publishing Group. p. 46. ISBN 978-0-440-33809-3 . Retrieved 12 July 2013 .
- Andy Dougan (1 June 2006). . Da Capo Press, Incorporated. p. 47. ISBN 978-0-7867-1773-6 . Retrieved 12 July 2013 .
- Robert Leckie (24 August 2010). . New York: HarperCollins. p. 513. ISBN 978-0-06-201536-5 . Retrieved 12 July 2013 .
- "Minutes of proceedings of the Institution of Civil Engineers, Volume 19" By Institution of Civil Engineers (Great Britain)
- Pegler, Martin (2011). . Osprey Publishing . Retrieved 18 November 2013 .
- “Minutes of proceedings of the Institution of Civil Engineers". Institution of Civil Engineers (Great Britain), 1860, p.12
- Rhea, Gordon C. (1997). . Louisiana: Louisiana State University Press. p. 94. ISBN 978-0-8071-2136-8 . Retrieved 12 July 2013 .
- David Eicher (14 March 2005). . Taylor Trade Publications. pp. 73–75. ISBN 978-1-58979-181-7 . Retrieved 12 July 2013 .
- John F. Cummings, III (June 2011). . Arcadia Publishing. p. 36. ISBN 978-0-7385-8246-7 . Retrieved 12 July 2013 .
- Gallagher, Gary (1 February 2010). . North Carolina: UNC Press Books. p. 297. ISBN 978-0-8078-9837-6 . Retrieved 12 July 2013 .
- , p. 5
- Copper, Jeff (July 1994). "Cooper's Scout rifle a gun for all reasons: whether it be for hunting or individual combat, this concept may just be the ultimate dual-purpose rifle". Guns & Ammo . 38 (7): 74. ISSN.
- Hesketh-Prichard, H.V. . pp. Chapter XI. ISBN 0-85052-426-1.
- , pp. 211–212
- Parker, Eric. Hesketh Prichard . p. 212.
- Hesketh-Prichard, H.V. . pp. Chapter 5. ISBN 0-85052-426-1.
- Hesketh-Prichard, H.V. . pp. Chapter 2. ISBN 0-85052-426-1.
- , pp. 10,19
- , p. 45
- , p. 77
- 30 November 2011 at the Wayback Machine.
- . Snipercentral.com . Retrieved 1 June 2011 .
- Rayment, Sean (30 April 2006). . The Daily Telegraph . London . Retrieved 30 March 2009 .
- Peter R. Senich: German Sniper 1914-45, Page 91
- . Shotgun.com.ua . Retrieved 1 June 2011 .
- (PDF) . ATK.com. Archived from (PDF) on 24 August 2007 . Retrieved 1 June 2011 .
- Gaijinass (6 May 2010). . . Retrieved 6 May 2010 . External link in
- Gavrilov, Yuri Rossiiskaya gazeta 19 October 2011.
- , p. 346
- Pardini, Sèverine (2 August 2007). . laprovence.com . Retrieved 14 May 2010 .
- Gregory Mast; Hans Halberstadt (January 2007). . Zenith Imprint. p. 22. ISBN 978-0-7603-3002-9 . Retrieved 12 July 2013 .
- Hans Halberstadt (18 March 2008). . St. Martin's Press. p. 29. ISBN 978-0-312-35472-5 . Retrieved 12 July 2013 .
- Martin Pegler (20 September 2011). . Osprey Publishing. p. 21. ISBN 978-1-84908-875-6 . Retrieved 12 July 2013 .
- Duffy, Michael (22 August 2009). . firstworldwar.com . Retrieved 10 May 2010 .
- Page, Lewis (28 November 2008). . The Register . Retrieved 10 May 2010 .
- GlobalSecurity.org (27 April 2005). . GlobalSecurity.org . Retrieved 10 May 2010 .
- Bray, Hiawatha (4 October 2005). . The Boston Globe .
- Petri Sarjanen (1998). Valkoinen kuolema: Talvisodan legendaarisen tarkka-ampujan Simo Häyhän tarina. ISBN 952-5170-05-5
- . www.k9history.com . Retrieved 2017-11-10 .
- Dockery, Kevin (3 July 2007). . New York: Penguin Group US. pp. 170–171. ISBN 978-1-4406-2890-0 . Retrieved 12 July 2013 .
- , p. 132 - "In 1971, the Provisional IRA shot dead forty-two British soldiers. In 1972, this figure rose to sixty-four, most of them killed by snipers."
- Jackson, Mike (2006). . MoD, Army Code 71842
- Craig Roberts; Charles W. Sasser (1 July 2004). . Pocket Books. p. 47. ISBN 978-1-4165-0362-0 . Retrieved 12 July 2013 .
- Pat Farey; Mark Spicer (1 May 2009). . MBI Publishing Company. pp. 225–227. ISBN 978-0-7603-3717-2 . Retrieved 12 July 2013 .
- Gilbert, Adrian (1996). "The Sniper Today". . St. Martin's Press. pp. 245–247. ISBN 978-0-312-95766-7 . Retrieved 12 July 2013 .
- Diamond, John (27 July 2006). . USA Today . Retrieved 21 March 2008 .
- Holmes, Paul (29 October 2006). . Reuters news service. Archived from on 13 March 2009 . Retrieved 21 March 2008 .
- Ponder, Jon (25 October 2006). . Pensito Review . Retrieved 21 March 2008 .
- Pickup, Oliver (15 March 2011). . Daily Mail . London.
- . Daily Mail . London. 14 March 2011.
- Ian Drury (9 July 2011). . Dailymail.co.uk . Retrieved 1 April 2013 .
- . Reuters . 24 August 2011.
- . Abcnews.go.com . Retrieved 1 April 2013 .
- . Archived from on 31 January 2012 . Retrieved 30 January 2012 .
- . Google.com. 30 January 2012 . Retrieved 1 April 2013 .
- , pp. 39–45, 53–55.
- Stuart Hadaway
- McKenney, Tom (23 September 2010). . Pelican Publishing. p. 79. ISBN 978-1-4556-0646-7.
- Rhea, Gordon C. The Battles for Spotsylvania Court House and the Road to Yellow Tavern May 7–12, 1864. Baton Rouge: Louisiana State University Press, 1997. ISBN 0-8071-3067-2 pp 93-96
- "Killed the Matabele God: Burnham, the American scout, may end uprising". New York Times . 25 June 1896. ISSN.
- West, James E. ; Peter O. Lamb; illustrated by Lord Baden-Powell (1932). He-who-sees-in-the-dark; the boys' story of Frederick Burnham, the American scout . Brewer, Warren and Putnam.
- "England's American Scout". New York Times (London Chronicle) . 5 May 1901. ISSN.
- Hamilton, J. C. M. (2008): Gallipoli Sniper: The life of Billy Sing . Sydney: Pan Macmillan Australia. ( ISBN 978-1-4050-3865-2)
- Brownlie, Robin (2003). . University of Toronto Press. p. 63. ISBN 978-0-19-541784-5.
- . Retrieved 13 October 2008 .
- , pp. 31–32
- (in Russian) at the website on Heroes of the Soviet Union and Russia
- . rarehistoricalphotos.com . Retrieved 2017-03-28 .
- . Owlcation . Retrieved 2017-03-28 .
- Storr, Jim (2009). The human face of war . New York: Continuum. p. 159. ISBN 9781847065230.
- . Militaryfocus.com . Retrieved 1 April 2013 .
- , p. 265
- . The Sydney Morning Herald . 26 April 2004.
- Lance Cpl. George J. Papastrat (29 March 2007). . Marine Corps News. Archived from on 29 May 2008 . Retrieved 24 March 2008 .
...famous Hathcock shot that killed an enemy from more than 2,500 yards (2,300 m) away...
- . GlobalSecurity . Retrieved 24 March 2008 .
When a 24-year old Marine sharpshooter named Carlos Norman Hathcock II chalked up the farthest recorded kill in the history of sniping - 2,500 yards (1.42 miles, a distance greater than 22 football fields) in February 1967 he fired a Browning M2.50 Cal. Machine Gun.
- Sgt. Grit (2006). . Retrieved 24 March 2008 .
Viet Cong shot dead by a round fired from a scope-mounted Browning M-2 .50 caliber machine gun at the unbelievable range of 2,500 yards (2,300 m).
- . www.chuckmawhinney.com . Retrieved 2017-03-28 .
- . Sniper Central . 2014-10-10 . Retrieved 2017-03-28 .
- Friscolanti, Michael (15 May 2006). . Maclean's . Retrieved 3 May 2010 .
- . Retrieved 1 March 2012.
- . Retrieved 9 February 2010.
- . Defense.gov . Retrieved 1 June 2011 .
- The Washington Times, U.S. Army sniper nails record shot , 11:16 p.m., Sunday, 15 January 2006
- . snipercentral.com. 2010 . Retrieved 9 May 2010 .
- By Tissa Ravindra Perera. Retrieved 9 February 2010.
- Reuters (29 October 2006). . alertnet.org . Reuters . Retrieved 9 May 2010 .
- Nicholson, Brendan (23 April 2011). . theaustralian.com.au . The Australian . Retrieved 11 February 2012 .
- Nicholson, Brendan (24 January 2011). . theaustralian.com.au . The Australian . Retrieved 11 February 2012 .
- John Pike. . Globalsecurity.org . Retrieved 1 June 2011 .
- John D. . Globalsecurity.org . Retrieved 1 June 2011 .
- Alpert, Lukas (2 May 2010). . New York Post . Retrieved 3 May 2010 .
- Bartlett, Derrick (12 April 2005). . Retrieved 26 January 2006 .
- Brookesmith, Peter (2007). Sniper: training, techniques and weapons (2007 ed.). St. Martin's Press. ISBN 978-0-312-36290-4. - Total pages: 192
- Chandler, Neil (2 May 2010). . The Daily Star . Retrieved 3 May 2010 .
- Dougan, Andy (2016). One Shot, One Kill: A History of the Sniper . William Collins. ISBN 978-0-00-818940-2.
- Drury, Ian (2 May 2010). . London: Daily Mail . Retrieved 3 May 2010 .
- Gilbert, Adrian (1996). Sniper: The Skills, the Weapons, and the Experiences (1996 ed.). St. Martin's Paperbacks. ISBN 978-0-312-95766-7. 352 pages
- Law, Clive M. (2005). Without Warning: Canadian Sniper Equipment of the 20th Century . Service Publications. ISBN 1-894581-16-4.
- Neville, Leigh (2016). Modern Snipers . Osprey Publishing. ISBN 978-1-4728-1534-7.
- Pegler, Martin (2006). Out of Nowhere: A History of the Military Sniper (2006 ed.). Osprey Publishing. ISBN 978-1-84603-140-3. <352 pages: 352
- Parker, Eric (1924). Hesketh Prichard, D.S.O., M.C.: hunter: explorer: naturalist: cricketer: author: soldier; a memoir (1924 ed.). T. F. Unwin ltd. 261 pages
- Plaster, Maj. John L. (1993). The ultimate sniper: an advanced training manual for military & police snipers (1993 ed.). Paladin Press. ISBN 978-0-87364-704-5. - Total pages: 453
- Plaster, Maj. John L. (2006). The ultimate sniper: an advanced training manual for military & police snipers (2006 ed.). Paladin Press. ISBN 978-1-58160-494-8. - Total pages: 584
- Plaster, Maj. John L. (2007). The History of Sniping and Sharpshooting (2007 ed.). Paladin Press. ISBN 978-1-58160-632-4. - Total pages: 704
- Prichard, Hesketh; Vernon, Hesketh (2004). Sniping in France 1914-18: With Notes on the Scientific Training of Scouts, Observers, and Snipers (2004 ed.). Helion & Company Limited. ISBN 978-1-874622-47-5. - Total pages: 143
- Sakaida, Henry; Hook, Christa (2003). Heroines of the Soviet Union 1941-45 (2003 ed.). Osprey Publishing. ISBN 978-1-84176-598-3. - Total pages: 64
- Senich, Peter R. (1982). The German sniper, 1914-1945 (1982 ed.). Paladin Press. ISBN 978-0-87364-223-1. - Total pages: 445
- Senich, Peter R. (1988). The Complete Book of U.S. Sniping (1988 ed.). Paladin Press. ISBN 978-0-87364-460-0. - Total pages: 280
- Shore, C. (1988). With British Snipers to the Reich (1988 ed.). Desert Pubns. ISBN 978-0-87947-122-4. - Total pages: 351
- Smith, Michael (2 May 2010). . London: The Sunday Times . Retrieved 3 May 2010 .
- Taylor, Peter (1997). Behind the mask: the IRA and Sinn Féin (1997 ed.). TV Books. ISBN 978-1-57500-061-9. - Total pages: 431
- Strong, Charles (2011). Kill Shot: The Deadliest Snipers of All Time (2011 ed.). Ulysses Press. ISBN 978-1-56975-862-5. - Total pages: 192
- Pegler, Martin (2006). Out of Nowhere: A History of the Military Sniper (2006 ed.). Osprey Publishing. ISBN 978-1-84603-140-3.
- Walter, John. (2017) Snipers at war: And equipment and operations, history (US Naval Institute Press, 2017)