The Arleigh Burke-class guided-missile destroyer USS Paul Ignatius (DDG 117) fires a MK-45 MOD 4 5-inch 62 caliber lightweight gun as part of a live-fire exercise during exercise At-Sea Demo/Formidable Shield, June 01, 2021.

Exercise At-Sea Demo/Formidable Shield, conducted by Naval Striking and Support Forces NATO on behalf of U.S. Sixth Fleet, is a live-fire integrated air and missile defense (IAMD) exercise that improves Allied interoperability using #NATO command and control reporting structures. ( #USNavy photo by Mass Communication Specialist 2nd Class Nathan T. Beard/Released)

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Credit to : Petty Officer 2nd Class Nathan Beard -
Naval Striking and Support Forces NATO