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U.S. Air Force Airman 1st Class Alexander Choi, 51st Security Forces Squadron turret gunner, test fires several blank rounds from an M240 machine gun during a field training exercise at Osan Air
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Sgt. Victor Mathow with 1st Battalion, 18th Infantry Regiment, performs a functions check on a M2 .50-caliber machine gun mounted in the turret of a Humvee during a vehicle gunnery exercise at
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