150323-N-JN664-173 MEDITERRANEAN SEA (March 23, 2015) Sailors assigned to the engineering department aboard USS Donald Cook (DDG 75) conduct high-speed propulsion checks during the material assessment safety check phase of Flag Officer Sea Training March 23, 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)