160518-N-TC720-204 MEDITERRANEAN SEA (May 18, 2016) Machinist's Mate 2nd Class Sean Thomas, from Inglewood, California, covers a ladderwell aboard USS Donald Cook (DDG 75) while practicing tactical team movements May 18, 2016. Donald Cook, an Arleigh Burke-class guided-missile destroyer, forward deployed to Rota, Spain is conducting a routine patrol 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 Mat Murch/Released)