171122-N-IA905-1186 INDIAN OCEAN (Nov. 22, 2017) Gunner’s Mate 2nd Class Christopher M. Debruler fires a Mark 38 25 mm machine gun during a live-fire gunnery exercise aboard the Arleigh Burke-class guided-missile destroyer USS Preble (DDG 88). Preble is conducting maritime security, forward presence and theater security operations. (U.S. Navy photo by Mass Communication Specialist Seaman Morgan K. Nall/Released)