The United States Secret Service ("USSS" or "Secret Service") is a premier federal law enforcement agency under the U.S. Department of Homeland Security.  Until 2003, the Service was part of the U.S. Department of the Treasury, as the agency was originally founded to combat the then-widespread counterfeiting of U.S. currency. 
The U.S. Secret Service is tasked with two distinct and critical national security missions:
- Investigative Mission – The investigative mission of the USSS is to safeguard the payment and financial systems of the United States from a wide range of financial and electronic-based crimes. Financial investigations include counterfeit U.S. currency, bank & financial institution fraud, mail fraud, wire fraud, illicit financing operations, and major conspiracies. Electronic investigations include cybercrime, network intrusions, identity theft, access device fraud, credit card fraud, and intellectual property crimes. The Secret Service is a key member of the FBI's Joint Terrorism Task Force (JTTF) which investigates and combats terrorism on a national and international scale, as well as of the High Intensity Drug Trafficking Areas (HIDTA) task force which seeks to reduce and eliminate drug trafficking in critical regions of the United States. The Service also investigates missing and exploited children and is a core partner of the National Center for Missing & Exploited Children (NCMEC). 
- Protective Mission – The protective mission of the USSS is to ensure the safety of the President of the United States, the Vice President of the United States, the President’s and Vice President’s immediate families, former presidents, their spouses, and their minor children under the age of 16, major presidential and vice presidential candidates and their spouses, and foreign heads of state. The protective mission includes protective operations to coordinate manpower and logistics with state and local law enforcement, protective advances to conduct site and venue assessments for protectees, and protective intelligence to investigate all manners of threats made against protectees. The Secret Service is the lead agency in charge of the planning, coordination, and implementation of security operations for events designated as National Special Security Events (NSSEs). As part of the Service’s mission of preventing an incident before it occurs, the agency relies on meticulous advance work and threat assessments developed by its Intelligence Division to identify potential risks to protectees. 
The Secret Service's initial responsibility was to investigate the counterfeiting of U.S. currency, which was rampant following the U.S. Civil War. The agency then evolved into the United States' first domestic intelligence and counterintelligence agency. Many of the agency's missions were later taken over by subsequent agencies such as the Federal Bureau of Investigation (FBI), Central Intelligence Agency (CIA), Drug Enforcement Administration (DEA), Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), and IRS Criminal Investigation Division (IRS-CI).
The Secret Service is mandated by Congress to carry out a unique dual mission: safeguarding the financial and critical infrastructure of the United States, and protecting the nation’s leaders. The two core missions of investigations and protection synergize with the other, providing crucial benefits to special agents during the course of their careers. Skills developed during the course of investigations which are also used in an agent’s protective duties include but are not limited to:
- Proficiency in analyzing handwriting and forgery techniques being applied in protective investigations of handwritten letters and suspicious package threats.
- Expertise in investigating electronic and financial crimes being applied in protective investigations of threats made against the nation's leaders on the Internet.
- Tactical operation (i.e. surveillance, arrests, and search warrants) and law enforcement writing (i.e. affidavits, after action reports, and operations plans) skills being applied to both investigative and protective duties.
- Partnerships that are created between field offices and local law enforcement during the course of investigations being used to gather both protective intelligence and in coordinating protection events.
The Secret Service's primary investigative mission is to protect the payment and financial systems of the United States from a wide range of financial and electronic-based crimes including counterfeit U.S. currency, bank & financial institution fraud, illicit financing operations, cybercrime, identity theft, intellectual property crimes, and any other violations that may affect the United States economy and financial systems. The agency's key focus is on large, high-dollar economic impact cases involving organized criminal groups. Financial criminals include embezzling bank employees, armed robbers at automatic teller machines, heroin traffickers, and criminal organizations that commit bank fraud on a global scale.
The USSS plays a leading role in facilitating relationships between other law enforcement entities, the private sector, and academia. The Service maintains the Electronic Crimes Task Forces, which focus on identifying and locating international cyber criminals connected to cyber intrusions, bank fraud, data breaches, and other computer-related crimes. Additionally, the Secret Service runs the National Computer Forensics Institute (NCFI), which provides law enforcement officers, prosecutors, and judges with cyber training and information to combat cybercrime.
Protection of our nation's highest elected leaders and other government officials remains the other key mission of the United States Secret Service. After the 1901 assassination of President William McKinley, Congress also directed the Secret Service to protect the President of the United States.
The Secret Service is authorized by law to protect: 
- The President, Vice President (or other officer next in the order of succession to the Office of President, should the Vice Presidency be vacant), President-elect and Vice President-elect
- The immediate families of the above individuals
- Former Presidents and their spouses for their lifetimes (except when the spouse divorces or remarries), under the Former Presidents Act. From 1997 until 2013, legislation was in place limiting Secret Service protection to former Presidents and their spouses to a period of 10 years from the date the former President leaves office. President Barack Obama signed legislation on January 10, 2013, reversing this limit and reinstating lifetime protection.   
- The widow or widower of a former President who dies in office or dies within a year of leaving office for a period of one year after the President's death (the Secretary of Homeland Security can extend the protection time)
- Children of former Presidents until age 16 or 10 years after the presidency
- Former Vice Presidents, their spouses, and their children under 16 years of age, for up to 6 months from the date the former Vice President leaves office (the Secretary of Homeland Security can extend the protection time)
- Visiting heads of states or governments and their spouses traveling with them
- Other distinguished foreign visitors to the United States and official representatives of the United States performing special missions abroad, as directed by the President
- Major presidential and vice presidential candidates
- The spouses of major presidential and vice presidential candidates (within 120 days of a general presidential election)
- Other individuals as designated per executive order of the President
- National Special Security Events, when designated as such by the Secretary of Homeland Security
Any of these individuals may decline Secret Service protection except the President, the Vice President (or other officer next in the order of succession to the Office of President), the President-elect, and the Vice President-elect. 
When Hillary Clinton became Secretary of State in 2009, the Secret Service continued to protect her at home; however the Diplomatic Security Service protected her while she was performing her duties as the Secretary of State, including foreign travel.
The Secret Service investigates thousands of incidents each year of individuals threatening the President of the United States.
In the face of budget pressure, hiring challenges and some high-profile lapses in its protective service role in 2014, the Brookings Institution and some members of Congress are asking whether the agency's focus should shift more to the protective mission, leaving more of its original mission to other agencies.  
With a reported one third of the currency in circulation being counterfeit at the time,  the Secret Service was created on July 5, 1865 in Washington, D.C., to suppress counterfeit currency. Chief William P. Wood was sworn in by Secretary of the Treasury Hugh McCulloch. It was commissioned in Washington, D.C. as the "Secret Service Division" of the Department of the Treasury with the mission of suppressing counterfeiting. The legislation creating the agency was on Abraham Lincoln's desk the night he was assassinated. At the time, the only other federal law enforcement agencies were the United States Park Police, the U.S. Post Office Department's Office of Instructions and Mail Depredations (now known as the United States Postal Inspection Service), and the U.S. Marshals Service. The Marshals did not have the manpower to investigate all crime under federal jurisdiction, so the Secret Service began to investigate everything from murder to bank robbery to illegal gambling. After the assassination of President William McKinley in 1901, Congress informally requested that the Secret Service provide presidential protection. A year later, the Secret Service assumed full-time responsibility for presidential protection. In 1902, William Craig became the first Secret Service agent to die while serving, in a road accident while riding in the presidential carriage.
The Secret Service was the first U.S. domestic intelligence and counterintelligence agency. Domestic intelligence collection and counterintelligence responsibilities were vested in the Federal Bureau of Investigation (FBI) upon the FBI's creation in 1908.
The Secret Service assisted in arresting Japanese American leaders and in the Japanese American internment during World War II. The U.S. Secret Service is not a part of the U.S. Intelligence Community. 
Taft assassination attempt
In 1909, President William H. Taft agreed to meet with Mexican President Porfirio Díaz in El Paso, Texas and Ciudad Juárez, Mexico, the first meeting between a U.S. and a Mexican president and also the first time an American president visited Mexico. But the historic summit resulted in serious assassination threats and other security concerns for the then small Secret Service, so the Texas Rangers, 4,000 U.S. and Mexican troops, BOI agents, U.S. marshals, and an additional 250 private security detail led by Frederick Russell Burnham, the celebrated scout, were all called in by Chief John Wilkie to provide added security.  On October 16, the day of the summit, Burnham discovered a man holding a concealed palm pistol standing at the El Paso Chamber of Commerce building along the procession route. Burnham signaled a Texas Ranger, Private C.R. Moore, and the two men captured and disarmed the assassin within only a few feet of Díaz and Taft, preventing the shooting of both Presidents.
In 1950, President Harry S. Truman was residing in Blair House while the White House, across the street, was undergoing renovations. On November 1, 1950, two Puerto Rican nationalists, Oscar Collazo and Griselio Torresola, approached Blair House with the intent to assassinate President Truman. Collazo and Torresola opened fire on Private Leslie Coffelt and other White House Police officers. Though mortally wounded by three shots from a 9 mm German Luger to his chest and abdomen, Private Coffelt returned fire, killing Torresola with a single shot to his head. As of 2017, Coffelt is the only member of the Secret Service killed while protecting a US president against an assassination attempt (Special Agent Tim McCarthy stepped in front of President Ronald Reagan during the assassination attempt of March 30, 1981, and took a bullet to the abdomen but made a full recovery). Collazo was also shot, but survived his injuries and served 29 years in prison before returning to Puerto Rico in late 1979.
In 1968, as a result of Robert F. Kennedy's assassination, Congress authorized protection of major presidential and vice presidential candidates and nominees.  In 1965 and 1968, Congress also authorized lifetime protection of the spouses of deceased presidents unless they remarry and of the children of former presidents until age 16. 
The Secret Service Presidential Protective Division safeguards the President of the United States and his immediate family. They work with other federal, state, and local law enforcement agencies and the military to safeguard the President when he travels in Air Force One, Marine One and by limousine in motorcades.
Although the most visible role of the Secret Service today, personal protection is an anomaly in the responsibilities of an agency focused on fraud and counterfeiting.
In 1984, the US Congress passed the Comprehensive Crime Control Act, which extended the Secret Service's jurisdiction over credit card fraud and computer fraud.
In 1990, the Secret Service initiated Operation Sundevil, which they originally intended as a sting against malicious hackers, allegedly responsible for disrupting telephone services across the entire United States. The operation, which was later described by Bruce Sterling in his book The Hacker Crackdown, affected a great number of people unrelated to hacking, and led to no convictions. The Secret Service, however, was sued and required to pay damages.
In 1994 and 1995, it ran an undercover sting called Operation Cybersnare.  The Secret Service has concurrent jurisdiction with the FBI over certain violations of federal computer crime laws. They have created 24 Electronic Crimes Task Forces (ECTFs) across the United States. These task forces are partnerships between the Service, federal/state and local law enforcement, the private sector and academia aimed at combating technology-based crimes.
In 1998, President Bill Clinton signed Presidential Decision Directive 62, which established National Special Security Events (NSSE). That directive made the Secret Service responsible for security at designated events. In 1999, the United States Secret Service Memorial Building was dedicated in DC, granting the agency its first headquarters. Prior to this, the agency's different departments were based in office space around the DC area. 
September 11 attacks
The New York City Field office was located at 7 World Trade Center. Immediately after the World Trade Center was attacked as part of the September 11 attacks, Special Agents and other New York Field office employees were among the first to respond with first aid. Sixty-seven Special Agents in New York City, at and near the New York Field Office, helped to set up triage areas and evacuate the towers. One Secret Service employee, Master Special Officer Craig Miller,  died during the rescue efforts. On August 20, 2002, Director Brian L. Stafford awarded the Director's Valor Award to employees who assisted in the rescue attempts. 
Effective March 1, 2003, the Secret Service transferred from the Treasury to the newly established Department of Homeland Security.
The USA Patriot Act, signed into law by President George W. Bush on October 26, 2001, mandated the Secret Service to establish a nationwide network of ECTFs in addition to the one already active in New York. As such, this mandate expanded on the agency's first ECTF—the New York Electronic Crimes Task Force, formed in 1995—which brought together federal, state and local law enforcement, prosecutors, private-industry companies, and academia. These bodies collectively provide necessary support and resources to field investigations that meet any one of the following criteria: significant economic or community impact; participation of organized criminal groups involving multiple districts or transnational organizations; or use of schemes involving new technology.  
The network prioritizes investigations that meet the following criteria:
- Significant economic or community impact,
- Participation of multiple-district or transnational organized criminal groups,
- Use of new technology as a means to commit crime.
Investigations conducted by ECTFs include crimes such as computer generated counterfeit currency; bank fraud; virus and worm proliferation; access device fraud; telecommunications fraud; Internet threats; computer system intrusions and cyber-attacks; phishing/spoofing; assistance with Internet-related child pornography and exploitation; and identity theft. 
The network includes ECTFs in the following 28 U.S. cities:
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On July 6, 2009, the U.S. Secret Service expanded its fight on cyber-crime by creating the first European Electronic Crime Task Force, based on the successful U.S. domestic model, through a memorandum of understanding with Italian police and postal officials. Over a year later, on August 9, 2010, the agency expanded its European involvement by creating its second overseas ECTF in the United Kingdom.  
Both task forces are said to concentrate on a wide range of "computer-based criminal activity," including:
- Identity theft
- Network intrusions
- Other computer-related crimes affecting financial and other critical infrastructures.
The overseas network includes ECTFs in the following European cities:
As of 2010, the Service had over 6,500 employees: 3,200 Special Agents, 1,300 Uniformed Division Officers, and 2,000 technical and administrative employees.  Special agents serve on protective details and investigate financial, cyber, and homeland security-related crimes.
In September 2014, the United States Secret Service came under criticism following two high-profile incidents involving intruders at the White House. One such intruder entered the East Room of the White House through an unlocked door. 
Another incident involved a violation of procedure in which an armed security guard for the Centers for Disease Control and Prevention rode in the same elevator as President Barack Obama during a visit to that agency's headquarters in Atlanta, Georgia, to discuss U.S. response to the Ebola virus epidemic in West Africa. The guard used his phone to record a video of Obama and refused to comply with a request to stop.  The guard had been arrested multiple times in the past, but had never been convicted of a crime.
Attacks on presidents
Since the 1960s, Presidents John F. Kennedy (killed), Gerald Ford (twice attacked, but uninjured) and Ronald Reagan (seriously wounded) have been attacked while appearing in public.   Agents on scene though not injured during attacks on Presidents include William Greer and Roy Kellerman. One of the agents was Robert DeProspero, the Special Agent In Charge (SAIC) of Reagan's Presidential Protective Division (PPD) from January 1982 to April 1985. DeProspero was deputy to Jerry Parr, the SAIC of PPD during the Reagan assassination attempt on March 30, 1981.  
The Kennedy assassination spotlighted the bravery of two Secret Service agents. First, an agent protecting Mrs. Kennedy, Clint Hill, was riding in the car directly behind the presidential limousine when the attack began. While the shooting continued, Hill leapt from the running board of the car he was riding on and jumped onto the back of the President's moving car and guided Mrs. Kennedy from the trunk back into the rear seat of the car. He then shielded the President and the First Lady with his body until the car arrived at the hospital.
Rufus Youngblood was riding in the vice-presidential car. When the shots were fired, he vaulted over the front seat and threw his body over Vice President Lyndon B. Johnson.  That evening, Johnson called Secret Service Chief James J. Rowley and cited Youngblood's bravery.   Youngblood would later recall some of this in his memoir, Twenty Years in the Secret Service.
The period following the Kennedy assassination was the most difficult in the modern history of the agency. Press reports indicated that morale among the agents was "low" for months following the assassination.   The agency overhauled its procedures in the wake of the Kennedy killing. Training, which until that time had been confined largely to "on-the-job" efforts, was systematized and regularized.
The Reagan assassination attempt also highlighted the bravery of several Secret Service agents, particularly agent Tim McCarthy, who spread his stance to protect Reagan as six bullets were being fired by the would-be assassin, John Hinckley, Jr.  McCarthy survived a .22-caliber round in the abdomen. For his bravery, McCarthy received the NCAA Award of Valor in 1982.  Jerry Parr, the agent who pushed President Reagan into the limousine, and made the critical decision to divert the presidential motorcade to George Washington University Hospital instead of returning to the White House, was also honored with U.S. Congress commendations for his actions that day.  After the near-successful assassination attempt on Ronald Reagan, it was clear that the Secret Service needed to increase its efficiency to protect the President.
Arrest and indictment of Max Ray Butler, co-founder of the Carders Market carding website. Butler was indicted by a federal grand jury in Pittsburgh, Pennsylvania, after his September 5, 2007 arrest, on wire fraud and identity theft charges. According to the indictment, Butler hacked over the Internet into computers at financial institutions and credit card processing centers and sold the tens of thousands of credit card numbers that he acquired in the process. 
Operation Firewall: In October 2004, 28 suspects—located across eight U.S. states and six countries—were arrested on charges of identity theft, computer fraud, credit-card fraud, and conspiracy. Nearly 30 national and foreign field offices of the U.S. Secret Service, including the newly established national ECTFs, and countless local enforcement agencies from around the globe, were involved in this operation. Collectively, the arrested suspects trafficked in at least 1.7 million stolen credit card numbers, which amounted to $4.3 million of losses to financial institutions. However, authorities estimated that prevented loss to the industry was in the hundreds of millions of dollars. The operation, which started in July 2003 and lasted for more than a year, led investigators to identify three cyber-criminal groups: Shadowcrew, Carderplanet, and Darkprofits. 
Arrest and indictment of Albert "Segvec" Gonzalez and 11 individuals; three U.S. citizens, one from Estonia, three from Ukraine, two from the People's Republic of China, one from Belarus, and one known only by an online alias. They were arrested on August 5, 2008, for the theft and sale of more than 40 million credit and debit card numbers from major U.S. retailers, including TJX Companies, BJ's Wholesale Club, OfficeMax, Boston Market, Barnes & Noble, Sports Authority, Forever 21, and DSW. Gonzalez, the main organizer of the scheme, was charged with computer fraud, wire fraud, access device fraud, aggravated identity theft, and conspiracy for his leading role in the crime. 
- Ranks of the Secret Service (not inclusive)
- Director of Secret Service
- Deputy Director
- Assistant Director
- Deputy Assistant Director
- Special Agent in Charge (SAIC)
- Deputy Special Agent in Charge (DSAIC)
- Assistant Special Agent in Charge (ASAIC)
- Assistant to the Special Agent in Charge (ATSAIC)
- Senior Special Agent (Senior SA)
- Special Agent (SA)
The Secret Service special agent position is highly competitive. In 2011, the Service accepted less than 1% of its 15,600 special agent applicants.  While the Secret Service has always been a popular career path for former military and law enforcement personnel, the Service seeks to hire agents from a diverse range of backgrounds in fulfilling its dual mission, including accountants, lawyers, scientists, engineers, and foreign language specialists.
At a minimum, a prospective agent must be a U.S. citizen, possess a current valid driver's license, be in excellent health and physical condition, possess visual acuity no worse than 20/60 uncorrected, correctable to 20/20 in each eye, and be between the ages of 21 and 37 at the time of appointment.  However, preference eligible veterans may apply after age 37. In 2009, the Office of Personnel Management issued implementation guidance on the Isabella v. Department of State court decision: OPM Letter. 
Prospective agents must also qualify for a TS/SCI (Top Secret / Sensitive Compartmented Information) clearance, and undergo an extensive background investigation, to include in-depth interviews, drug screening, medical diagnosis, and full-scope polygraph examination. 
Special agents receive training in two locations, totaling approximately 7 months. The first phase, the Criminal Investigator Training Program (CITP) is conducted at the Federal Law Enforcement Training Centers (FLETC) at Glynco, GA, lasting approximately 12 weeks. The second phase, the Special Agent Training Course (SATC) is conducted at the Secret Service Academy, James J. Rowley Training Center (JJRTC), just outside Washington, D.C in Laurel, Maryland, lasting approximately 18 weeks. 
A typical special agent career path, depending upon performance and promotions that affect individual assignments, begins with the first six to eight years on the job assigned to a field office. Applicants are directed to list their office location preference during the application process, and upon receiving a final job offer, usually have several locations to choose from. 
After their field office experience, agents are usually transferred to a protective assignment where they will stay for three to five years. Following their protective assignment, many agents return to a field office for the rest of their careers, or opt for a headquarters based assignment located in Washington, D.C. During their careers, agents also have the opportunity to work overseas in one of the agency's international field offices. This typically requires foreign language training to ensure language proficiency when working alongside the agency's foreign law enforcement counterparts. 
Special agents are hired at either the GL-07 or GL-09 grade level, depending on individual qualifications and/or education.  Agents are eligible for promotion on a yearly basis, from GL-07, to GL-09, to GS-11, to GS-12, to GS-13 (GL-08 and GS-10 grade levels are skipped). The full performance grade level for a journeyman agent is GS-13, which a GL-07 and GL-09 agent may reach in as little as four and three years respectively. GS-13 agents are eligible for competitive promotion to supervisory agent positions, which compasses the GS-14, GS-15, and SES grade levels. GS-13 agents who wish to remain as field agents continue to advance the GS-13 step level on a near yearly basis, capping at GS-13 Step-10.
Special agents also qualify for Law Enforcement Availability Pay (LEAP), a type of premium overtime pay which provides agents with an additional 25% bonus pay on top of their salary, given that they work an average workweek of 50 hours as opposed to 40.  A newly hired GL-07 and GL-09 agent, and newly promoted GS-11, GS-12, GS-13 Step-1, and GS-13 Step-10 agent living in the San Francisco Bay area and qualifying for LEAP pay, will earn approximately $69k, $77k, $90k, $108k, $129k, and $162k respectively. 
Due to the nature of their work and unique among their federal law enforcement counterparts (e.g. FBI, DEA, ATF, ICE), Secret Service agents are regularly eligible for scheduled overtime pay (SOT pay) in addition to LEAP overtime pay for hours worked beyond 50 per week, the pay of which is not to exceed Level II of the Executive Schedule (currently capped at $187k per year). 
Uniformed Division Officer
The Secret Service Uniformed Division is a security police similar to the U.S. Capitol Police or DHS Federal Protective Service and is in charge of protecting the physical White House grounds and foreign diplomatic missions in the Washington, D.C. area. Established in 1922 as the White House Police, this organization was fully integrated into the Secret Service in 1930. In 1970, the protection of foreign diplomatic missions was added to the force's responsibilities, and its name was changed to the Executive Protective Service. The name United States Secret Service Uniformed Division was adopted in 1977.
Secret Service Uniformed Division officers provide protection for the White House Complex, the Vice President's residence, the main Treasury Building and Annex, and foreign diplomatic missions and embassies in the Washington, D.C., area. Additionally, Uniformed Division officers travel in support of presidential, vice presidential and foreign head of state government missions.  Officers may, as their careers progress, be selected to participate in one of several specialized units, including the:
- Canine Unit: Performing security sweeps and responding to bomb threats and suspicious packages.
- Emergency Response Team: Providing a coordinated tactical response for the White House and other protected facilities.
- Countersniper Team: Utilizing observation, sighting equipment and high-performance weapons to provide a secure environment for protectees.
- Motorcade Support Unit: Providing motorcycle tactical support for official movements of motorcades.
- Crime Scene Search Unit: Photographing, collecting and processing physical and latent evidence.
- Office of Training: Serving as firearms and classroom instructors or recruiters.
- Special Operations Section: Handling special duties and functions at the White House Complex, including conducting the daily congressional and public tours of the White House. 
Secret Service special officers (not to be confused with Uniformed Division Officers) are federal agents who work within the Special Agent Division and perform a wide range of security functions and support assignments as part of the protective mission for the Secret Service. Whereas special agents alternate between protection and investigative assignments, special officers are hired only to work protection details. They must have a familiarity with all phases of protective responsibilities sufficient to assist in protective movements, cover designated security posts and drive protective vehicles.
Assignments may include
- Maintaining designated protective security posts that control movement of persons into and around multiple Secret Service facilities and associated areas
- Inspecting all operational, safety, emergency, and convenience equipment of protective vehicles to ensure peak-operating condition
- Driving protective or follow-up vehicles
- Monitoring and operating various communications equipment
- Using various advanced x-ray screening technologies to detect and identify high-risk items
Special officers are sworn law enforcement officers, and are authorized to make arrests in connection with their official duties. They are classified as federal agents but use "special officer" as their official title much the same way as Deputy US Marshals are special agents but use the title "Deputy US Marshal".
Newly appointed special officers must successfully complete eight (8) weeks of intensive training at the Special Officer Basic Training Course at the Secret Service James J. Rowley Training Center just outside Washington, D.C. The training includes courses such as Criminal Law, Laws of Arrest, Search and Seizure, Control Tactics, Civil Liability, Emergency Medicine, Basic Water Safety, Firearms and Weapons Handling, Radio Communications, Emergency Driving and Physical Fitness Training.
Weapons and equipment
Since the agency's inception, a variety of weapons have been carried by its agents.
Initially the firearms were privately procured and there was little if any standardization. In the 1930s, the USSS issued the Colt M1911A1 pistol in .45 ACP caliber. In the 1950s and 1960s, Special Agents carried the Smith & Wesson Model 36 and Colt Detective Special.38-Special revolvers.
Between 1981 and 1991, the Secret Service issued the Smith & Wesson Model 19 and the Smith & Wesson Model 66.357 Magnum revolvers, with 2.5-inch barrels all the way up to the 4-inch-barreled models, loaded with hollow-point rounds.
By 1992, the standard issue weapon became the SIG Sauer P228 9mm pistol. This weapon stayed in service through 1999.
The Secret Service replaced the Thompson submachine gun with the Uzi submachine gun in the 1970s. Uzis that the Secret Service used have slightly shorter-than-standard barrels so they could to fit inside the standard size Samsonite briefcases that concealed them. They phased out the Uzi in the mid 1990s and replaced it with the H&K MP5. The Secret Service was the last Federal agency to use the Uzi.
Agents and officers are trained on standard shoulder weapons that include the FN P90 submachine gun, the 9mm Heckler & Koch MP5 submachine gun, and the 12-gauge Remington 870 shotgun. The agency has initiated a procurement process to ultimately replace the MP5 with a 5.56mm rifle HK416. 
The agency uses Motorola XTS and APX radios and surveillance kits in order to maintain communications. These radios are known to use DES encryption keys. When operationally required, members of the Special Operations Division use military grade radios that use Type 1 encryption algorithms.
When transporting the President in a motorcade, the Secret Service uses a fleet of custom-built armored Cadillac Parade Limousines, the newest and largest version of which is known as " The Beast ". Armored Chevrolet Suburbans are also used when logistics require such a vehicle or when a more low profile appearance is required. For official movement the limousine is affixed with U.S. and presidential flags and the presidential seal on the rear doors. For unofficial events the vehicles are left sterile and unadorned. 
Special Agents and Special Officers of the Secret Service wear attire that is appropriate for their surroundings, in order to blend in as much as possible. In most circumstances, the attire of a close protection shift is a conservative suit, but it can range from a tuxedo to casual clothing as required by the environment. Stereotypically Secret Service agents are often portrayed wearing reflective sunglasses and a communication earpiece. Often their attire is customized to conceal the wide array of equipment worn in service. Agents wear a distinctive lapel pin that identifies them to other agents.
The attire for Uniformed Division Officers includes standard police uniforms or utility uniforms and ballistic/identification vests for members of the countersniper team, Emergency Response Team (ERT), and canine officers. The shoulder patch of the Uniformed Division consists of the U.S. coat of arms on white or black, depending on the garment. Also, the shoulder patch is embroidered with "U.S. Secret Service Uniformed Division Police" around the emblem. 
The Secret Service has agents assigned to 136 field offices and field agencies, and the headquarters in Washington, D.C. The Service's offices are located in cities throughout the United States and in Brazil (Brasilia), Bulgaria (Sofia), Canada (Montreal, Ottawa, Toronto, Vancouver), Colombia (Bogota), China (Hong Kong), France (Paris, Lyon), Germany (Frankfurt), Italy (Rome), Mexico (Mexico City), Netherlands (The Hague), Romania (Bucharest), Russia (Moscow), South Africa (Pretoria), Spain (Madrid), Thailand (Bangkok), and the United Kingdom (London). The offices in Lyon and The Hague are respectively responsible for liaison with the headquarters of Interpol and Europol, located in those cities. 
In April 2012, an incident involving the president's security detail received international press attention. The incident involved 11 agents and personnel from four branches of the U.S. military; they allegedly engaged prostitutes while assigned to protect the U.S. President at the 6th Summit of the Americas in Cartagena, Colombia. As of April 24, 2012, nine employees had resigned or retired.
After the incident was publicized, the Secret Service implemented new rules for its personnel.    The rules prohibit personnel from visiting "non-reputable establishments"  and from consuming alcohol fewer than ten hours before starting work. Additionally, they restrict who is allowed in hotel rooms. 
A few weeks later, stories emerged of Secret Service agents hiring strippers and prostitutes prior to Obama's 2011 visit to El Salvador. 
In 2015, two inebriated senior service agents drove an official car into the White House complex and collided with a barrier. One of the congressmen in the United States House Committee on Oversight and Government Reform that investigated that incident was Jason Chaffetz. In September 2015, it was revealed that 18 Secret Service employees or supervisors, including Assistant Director Ed Lowery, accessed an unsuccessful 2003 application by Chaffetz for employment with the agency and discussed leaking the information to the media in retaliation for Chaffetz' investigations of agency misconduct. The confidential personal information was later leaked to The Daily Beast. Agency Director Joe Clancy apologized to Chaffetz and said that disciplinary action would be taken against those responsible. 
In popular culture
- Mister 880 (1950): Unlike most films with a Secret Service theme, this one features their anti-counterfeiting role: an agent (Burt Lancaster) tracks down an elderly man (Edmund Gwenn) who counterfeits only small amounts of money.
- Suddenly (1954 film): A group of hired assassins take over a house overlooking a rail-station in the small town of Suddenly where the President of the United States is expected to make a stop. The town's sheriff and a team of Secret Service agents work to foil the plot. Stars Frank Sinatra, Sterling Hayden, James Gleason and Nancy Gates.
- To Live and Die in L.A. (1985): A Secret Service agent (William L. Petersen) is determined to bring down, by any means necessary, a counterfeiter (Willem Dafoe) who murdered the agent's partner.
- Assassination (1987): U.S. Secret Service agent Jay Killion (Charles Bronson) must protect First Lady Lara Royce Craig (Jill Ireland) from a plot on her life.
- The Bodyguard (1992): Kevin Costner stars as a former Secret Service agent who is hired as a bodyguard to protect a music star, played by Whitney Houston, from an unknown stalker.
- In the Line of Fire (1993): Psychological thriller in which Clint Eastwood plays a Secret Service Agent who had been on the presidential protection detail during the John F. Kennedy assassination. He is now pursuing a deranged former CIA special operations assassin who is intent on killing the current U.S. President.
- Guarding Tess (1994): Nicolas Cage plays an agent assigned to guard a former First Lady.
- Hackers (1995): Secret Service Agent Richard Gill (Wendell Pierce) is responsible for the pursuit of the young hackers throughout the entire film.
- First Kid (1996): Sinbad and Timothy Busfield appear as Secret Service agents in charge of protecting the President's son.
- Murder at 1600 (1997): A thriller adaptation starring Wesley Snipes of the novel Murder In The White House by Margaret Truman, daughter of President Truman.
- First Target (1999): Daryl Hannah is a Secret Service agent who uncovers a plot involving senior US politicians and rogue Secret Service agents to kill the President whilst on vacation.
- Wild Wild West (1999): Action parody starring Will Smith and Kevin Kline as, respectively, U.S. Army Captain James West and U.S. Marshal Artemus Gordon. Set in 1869, they battle a madman who kidnaps President Ulysses S. Grant as part of his plot to dismember the United States. At the end of the film, President Grant promotes them to Agents #1 and #2 of his new Secret Service.
- First Daughter (2004): Katie Holmes as the daughter of the President, who goes to college.
- The Sentinel (2006): Thriller starring Michael Douglas, Kiefer Sutherland, and Eva Longoria as Secret Service agents investigating a potential assassination attempt and traitor in the Secret Service.
- Vantage Point (2008): An assassination attempt on the President of the United States is seen from a different set of vantage points through the eyes of eight witnesses. Dennis Quaid plays the Secret Service agent pursuing the terrorists.
- Olympus Has Fallen (2013): An attempt to destroy and capture the White House and the President of United States, President Benjamin Asher (Aaron Eckhart), by a North Korean terrorist leader, Kang Yeonsak (Rick Yune) with his commandos. A Secret Service agent, Mike Banning (Gerard Butler), was trapped in the White House (Olympus) and works to save the President. Continued in the sequel London Has Fallen (2016)
- White House Down (2013): John Cale (Channing Tatum) is a U.S. Capitol Police officer and is a hopeful candidate for a special agent position at the U.S. Secret Service. Cale attempts to foil a terrorist attack on the White House and save the President from the terrorists.
- The Purge: Election Year (2016): Former LAPD sergeant Leo Barnes (Frank Grillo) is the chief of security for a US Senator running for the presidency and hoping to outlaw an annual 12-hour period taking place from March 21 to 22 wherein all crimes are legal. He is later promoted to chief of the Secret Service upon the Senator's victory in the election two months after the final annual Purge.
- "Max 2: White House Hero " (2017): Adventure starring Zane Austin where Max, a dog develop a bond.
- The Wild Wild West (1965): A highly popular Western action series, set in the early- to mid- 1870s, starring Robert Conrad and Ross Martin as Secret Service agents James West and Artemus Gordon. West and Gordon pursue a variety of villains across the old west and often report directly to President Ulysses S. Grant. Two reunion telemovies were screened in 1979 and 1980, followed by the film Wild Wild West (above).
- 24 (2001): Involves many characters and operations within the Secret Service as they protect the presidents throughout the series, most notable Agent Aaron Pierce, played by Glenn Morshower.
- House of Cards (2013): Edward Meechum initially serves as a bodyguard to President Frank Underwood when he was Majority Whip but later gets promoted to the Secret Service when Underwood became Vice President (remaining on his detail when he becomes president). During an assassination attempt on President Underwood, Edward Meechum takes a bullet for the president and shoots and kills the gunman before immediately dying from his injuries.
- Intelligence (2014): U.S. Secret Service agent Riley Neal (Meghan Ory) is recruited by the U.S. Cyber Command to provide protective services for Cyber Command agent Gabriel Vaughn (Josh Holloway), into whose brain a high-tech microchip has been implanted.
- Wayward Pines (2015): After a car crash, U.S. Secret Service agent Ethan Burke (Matt Dillon) wakes up in the mysterious town of Wayward Pines, where the inexplicable happens and from which there is no escape.
- Resident Evil 4 (2007): Leon S. Kennedy is a Secret Service agent after the events of Resident Evil 2. His mission in the game is to find the President's daughter, who has been kidnapped.
- Secret Service (2008): A first-person shooter video game, developed by Cauldron HQ and published by Activision Value for Microsoft Windows, PlayStation 2 and Xbox 360.
Similar federal law enforcement agencies
- Federal Bureau of Investigation (FBI)
- Drug Enforcement Administration (DEA)
- Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF)
- U.S. Immigration and Customs Enforcement (ICE)
- U.S. Postal Inspection Service (USPIS)
- U.S. Marshals Service (USMS)
- Federal Air Marshal Service (FAMS)
- U.S. Diplomatic Security Service (DSS)
- Naval Criminal Investigative Service (NCIS)
- U.S. Army Criminal Investigation Command (CID)
- U.S. Air Force Office of Special Investigations (OSI)
- U.S. Customs and Border Protection (CBP)