Master Sgt. Chet Nance, 434th Security Forces Squadron combat arms noncommissioned officer in charge, checks an M-4 rifle's trigger-pull to ensure it falls under the measurements outlined in technical orders at Grissom Air Reserve Base, Ind., Jan. 28, 2014. Grissom's combat arms instructors are responsible for inspections and repairs of approximately 1,600 weapons. (U.S. Air Force photo/Tech. Sgt. Benjamin Mota)
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