171024-N-FP878-102 ATLANTIC OCEAN (Oct. 24, 2017) The Arleigh Burke-class guided-missile destroyer USS Donald Cook (DDG 75) fires the Mark 45 5-inch gun during a precision aim and calibration live-fire exercise Oct. 24, 2017. Donald Cook, forward-deployed to Rota, Spain, is on its sixth patrol in the U.S. 6th Fleet area of operations in support of regional allies and partners, and U.S. national security interests in Europe. (U.S. Navy photo by Mass Communication Specialist 1st Class Theron J. Godbold /Released)