180331-N-MT837-0539 PACIFIC OCEAN (March 31, 2018) A Mark 38 25 mm machine gun system fires during a live-fire exercise on the fantail of the Nimitz-class aircraft carrier USS Carl Vinson (CVN 70). The Carl Vinson Carrier Strike Group is operating in the western Pacific as part of a regularly scheduled deployment. (U.S. Navy photo by Mass Communication Specialist 3rd Class Dylan M. Kinee/Released)