U.S. Navy Lt. Doris Chen, assigned to Fleet Surgical Team 1, talks to a sailor role-playing as a casualty during a mass casualty drill aboard the amphibious assault ship USS Peleliu under way in the Pacific Ocean Aug. 5, 2012. Peleliu and its amphibious ready group are conducting a composite training unit exercise, a pre-deployment certification that evaluates a ship's ability to conduct military operations at sea and support expeditionary operations ashore.