Staff Sgt. Richard Trimble, 90th Missile Wing, F.E. Warren Air Force Base, Wyo., fires an M-240 machine gun at a set of targets while Senior Airman Jeff Delong, 620th Ground Combat Training Squadron instructor, observes him Sept. 23, 2015, during a shooting portion of the 2015 Global Strike Challenge security forces competition on Camp Guernsey, Wyo. Ten security forces teams from eight Global Strike Command bases are competing to determine which base trains the best of the best. (U.S. Air Force photo by Senior Airman Brandon Valle)
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