170818-N-FP878-006 ALTLANTIC OCEAN (Aug. 18, 2017) Gas Turbine Systems Technician (Mechanical) 3rd Class Jon Hebert conducts a seawater alignment during a mobility engineering assessment 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)