150223-N-JN664-063 MEDITERRANEAN SEA (Feb. 23, 2015) Sailors conduct pipe patching procedures during a general quarters drill aboard the guided-missile destroyer USS Donald Cook (DDG 75). Donald Cook, forward-deployed to Rota, Spain, is conducting naval operations in the U.S. 6th Fleet area of responsibility in support of U.S. national security interests in Europe. (U.S. Navy photo by Mass Communication Specialist 2nd Class Karolina A. Oseguera/Released)