160428-N-TC720-552 ROTA, Spain (April 28, 2016) - Sailors aboard USS Donald Cook (DDG 75) heave on a mooring line as the ship pulls into Rota, Spain, April 28, 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)