Hospital Corpsman 3rd Class Matthew Williams from Groton, Conn., and Hospital Corpsman 2nd Class Roseann Robles from Monterey, Calif., prepare to give a simulated patient an X-ray during a mass casualty drill aboard amphibious assault ship USS Peleliu. Peleliu is the flagship for the Peleliu Amphibious Ready Group and is underway conducting composite training unit exercise in the Pacific Ocean with amphibious dock landing ship USS Rushmore and amphibious transport dock ship USS Green Bay.