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U.S. Air Force Staff Sgt. Jonathan Killebrew, 386th Expeditionary Security Forces Squadron, fires a Mark 19 40mm grenade machine gun on May 7, 2014 at an undisclosed location in Southwest Asia. Killebrew is deployed from the 99th Security Forces Squadron at Nellis Air Force Base, Nev. Qualified Security Forces members practice shooting about every two months to maintain proficiency with the weapons system. (U.S. Air Force photo by Staff Sgt. Jeremy Bowcock)
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