Sailors aboard USS Donald Cook (DDG 75) perform a foreign object debris (FOD) walkdown before flight quarters Nov. 24, 2014. Donald Cook, an Arleigh Burke-class guided-missile destroyer, home-ported in 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)