Staff Sgt. Nathan Warren, 28th Security Forces Squadron combat arms instructor, fires an M-4 assault rifle during the shooting range portion of the 2015 Global Strike Challenge security forces competition at Camp Guernsey, Wyo., Sept. 23, 2015. Teams from across Air Force Global Strike Command, the Air National Guard, Air Force Reserve Command, Air Force Materiel Command and Air Combat Command took part in the competitions at various locations across the country, with winners to be announced at Barksdale Air Force Base, La., Oct. 21. (U.S. Air Force photo by Senior Airman Brandon Valle/Released)
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