170813-N-FP878-010 ATLANTIC OCEAN (Aug. 13, 2017) Sailors prepare to launch a weather balloon used for a radar calibration maintenance check from 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)