U.S. Air Force Senior Airman David O’Brien, 7th Security Forces Squadron, overlooks an Airman while he fires a M240 machine gun Aug. 10, 2012, during a heavy-weapons qualification course at Camp Bowie, Texas. Prior to firing at the range, Airmen participate in a four-day classroom course, where they learn how to clean, disassemble, reassemble, operate, perform immediate actions and about different types of loads for the weapon. (U.S. Air Force photo by Airman 1st Class Damon Kasberg/Released)
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