171015-N-FP878-149 ATLANTIC OCEAN (Oct. 15, 2017) The Arleigh Burke-class guided-missile destroyer USS Donald Cook (DDG 75) fires a standard missile 3 during exercise Formidable Shield 2017. Formidable Shield is a U.S. 6th Fleet led, Naval Striking and Support Forces NATO-conducted exercise which will 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 1st Class Theron J. Godbold/Released)