Petty Officer 3rd Class Addam Morrow replaces a potable water valve aboard guided-missile destroyer USS Arleigh Burke (DDG 51). Arleigh Burke is deployed to participate in Exercise Joint Warrior 2011-2. Joint Warrior serves as a certifying event for ships deploying with coalition forces in future operations. (U.S. Navy photo by Petty Officer 3rd Class Scott Pittman)