181212-N-UX013-1082 ATLANTIC OCEAN (Dec. 12, 2018) The Arleigh-Burke class guided-missile destroyer USS Jason Dunham (DDG 109) fires its Mark 38 25 mm machine gun during a pre-aim calibration test, Dec. 12, 2018. Jason Dunham is deployed to the U.S. 6th Fleet area of operations in support of regional allies and partners as well as U.S. national security interests in Europe and Africa. (U.S. Navy photo by Mass Communication Specialist 2nd Class Jonathan Clay/Released)