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