Staff Sgt. Jonathan Van Etten, 39th Security Forces military working dog handler, inspects an M-4 rifle before a combat arms training and maintenance class Aug. 14, 2014, Incirlik Air Base, Turkey. Airmen assigned to the 39th Security Forces Squadron are required to fire their weapons at least once a year on both M-4 and M-9 weapons systems. (U.S. Air Force photo by Senior Airman Nicole Sikorski/Released)
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