Gunner's Mate 2nd Class Carlos Rentas, from Penuelas, Puerto Rico, tests the high plenum-water sensor for the Mk41 Mod 7 Vertical Launching System (VLS) as part of an annual preventative maintenance system (PMS) check aboard the guided-missile destroyer USS Winston S. Churchill (DDG 81). Churchill is deployed with the John C. Stennis Strike Group to the U.S. 5th Fleet area of responsibility conducting maritime security operations, theater security cooperation efforts and support missions for Operation Enduring Freedom. (U.S. Navy photo by Mass Communication Specialist 2nd Class Aaron Chase/Released)