170728-N-FP878-303 ATLANTIC OCEAN (July 28, 2017) The Arleigh Burke-class guided-missile destroyer USS Donald Cook (DDG 75) fires its 5-inch gun during a precision aim calibration live-fire exercise. Donald Cook is forward-deployed to Rota, Spain, conducting its sixth patrol in the U.S. 6th Fleet area of operations. (U.S. Navy photo by Mass Communication Specialist 1st Class Theron J. Godbold/Released)