ATLANTIC OCEAN (May 16, 2021) The Arleigh Burke-class guided-missile destroyer USS Roosevelt (DDG 80) fires a Mark 45 5-inch gun during a gunnery exercise as part of At-Sea Demo/Formidable Shield, May 16, 2021. At-Sea Demo/Formidable Shield, conducted by Naval Striking and Support Forces NATO on behalf of U.S. 6th Fleet, is a live-fire integrated air and missile defense (IAMD) exercise that improves Allied interoperability using NATO command and control reporting structures. (U.S. Navy photo by Mass Communication Specialist 2nd Class Andrea Rumple)