Machinist Mate Fireman Mariah London performs a jack-o-water sample test aboard the aircraft carrier USS John C. Stennis (CVN 74). John C. Stennis is deployed 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 3rd Class Will Tyndall/Released)