150401-N-JN664-045 ATLANTIC OCEAN (April 1, 2015) Sailors from the Combat Systems Department aboard USS Donald Cook (DDG 75) perform pre-fire maintenance to a close-in weapons system (CIWS) during flag officer sea training (FOST) April 1, 2015. 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. (U.S. Navy photo by Mass Communication Specialist 2nd Class Karolina A. Oseguera/Released)