170313-N-KP948-051 ATLANTIC OCEAN (March 13, 2017) A Mark 45 5-inch gun fires aboard USS Donald Cook (DDG 75) during a live fire gunnery exercise as the ship conducts Flag Officer Sea Training 2017. Donald Cook, an Arleigh Burke-class guided-missile destroyer, forward-deployed to Rota, Spain, is conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe and Africa. (U.S. Navy photo by Mass Communication Specialist 3rd Class Alyssa Weeks/Released)