U.S. Air Force Staff Sgt. Zach Barkhymer, 99th Security Forces Squadron combat arms instructor, conducts a bi-annual weapons inspection Feb. 21, 2014, at Nellis Air Force Base, Nev. Barkhymer took apart the gun and inspected every element to ensure proper operation. (U.S. Air Force photo by Senior Airman Jason Couillard)
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