190309-N-DX072-1012 PACIFIC OCEAN (March 9, 2019) The amphibious transport dock ship USS Green Bay (LPD 20) fires its Mark 46 30 mm gun during a training exercise with other U.S. Navy warships. U.S. Navy warships train together to increase the tactical proficiency, lethality, and interoperability of participating units in an Era of Great Power Competition. (U.S. Navy photo by Mass Communication Specialist 2nd Class Anaid Banuelos Rodriguez/Released)