Blaine Cooper, 36, also known as Stanley Blaine Hicks, is a member of the militia, Citizens For Constitutional Freedom.

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He lives in Humboldt, Arizona, a small town on the outskirts of Prescott, and also participated in the 2014 Neveda stand-off.

Cooper frequently posts videos on YouTube related to causes ranging from support for civilian patrols along the U.S.-Mexico border to protest against federal land management practices.

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He has registered a film company, Third Watch Media.

Cooper was convicted of aggravated assault, a felony, in 2009.

He faced other charges in Arizona courts, but they were dismissed.

The leader of an Arizona group, Veterans on Patrol, accused Cooper of instigating a fistfight at the Malheur compound when the veterans group tried to enter.

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Cooper tried to join the Marines, but was screened out.

"All applicants are screened for mental, moral and physical qualifications," a spokeswoman wrote.

"Hicks failed in at least one of those categories."

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