170321-N-BY095-052 PACIFIC OCEAN (March 21, 2017) The Arleigh Burke-class guided missile destroyer USS Shoup (DDG 86) fires its Mark 45 5-inch gun during a live-fire exercise while underway conducting a composite training unit exercise with the Nimitz Carrier Strike Group. (U.S. Navy photo by Mass Communication Specialist 3rd Class Maria I. Alvarez/Released)