ATLANTIC OCEAN (May 31, 2021) The Arleigh Burke-class guided-missile destroyer USS Paul Ignatius (DDG 117) pulls alongside the Military Sealift Command Fast Combat Support Ship USNS Supply (T-AOE 6) for a replenishment-at-sea during exercise At-Sea Demo/Formidable Shield, May 31, 2021. Exercise 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 Nathan T. Beard)