170817-N-FP878-006 ROTA, Spain (Aug. 17, 2017) Fire Controlman 2nd Class Enmanuel Valdez stands armed sentry watch aboard the Arleigh Burke-class guided-missile destroyer USS Donald Cook (DDG 75). Donald Cook is forward-deployed to Rota, Spain, conducting its 6th patrol in the U.S. 6th Fleet area of operations. (U.S. Navy photo by Mass Communication Specialist 1st Class Theron J. Godbold/Released)