171009-N-UB406-078 ATLANTIC OCEAN (Oct. 9, 2017) The Arleigh Burke-class guided missile destroyer USS Mitscher (DDG 57) fires a Mark 45 5-inch gun during a live fire exercise as part of exercise Formidable Shield (FS) 2017. FS-17 is a U.S. 6th Fleet-led, Naval Striking and Supporting Forces NATO-conducted exercise designed to improve allied interoperability in a live-fire integrated air and missile-defense environment using NATO command and control reporting structures. (U.S. Navy photo by Mass Communication Specialist Seaman Cameron Stoner/Released)