U.S. Marine Cpl. Charlie Cummins, Detachment One, Communication Company, Combat Logistics Regiment 45, 4th Marine Logistics Group supply specialist, fires an M-16 rifle loaded with blank ammunition at fellow Marines attacking his position during a joint, mass-casualty exercise held at Grissom Air Reserve Base, Ind., Aug. 4, 2013. Cummins and other Marines played the opposing force during the scenario that brought Grissom's Airmen, Soldiers and Marines together in a joint operation that was held at a simulated overseas location. (U.S. Air Force photo/Tech. Sgt. Mark R. W. Orders-Woempner)
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