Machinist's Mate 3rd Class Quanquan Qi tightens a bolt after changing one of the ship's water filters in the main engine room of the Arleigh Burke-class guided-missile destroyer USS Stout (DDG 55) while in port at Naval Support Activity Souda Bay. Stout, homeported in Norfolk, Va., is on a scheduled deployment supporting maritime security operations and theater security cooperation efforts in the U.S. 6th Fleet area of responsibility. (U.S. Navy photo by Mass Communication Specialist 2nd Class Amanda R. Gray/Released)