A U.S. Navy SH-60 Seahawk Helicopter, top left, and a U.S. Marine Corps UH-1Y Viper helicopter fly over the the amphibious assault ship USS Peleliu, foreground, and the amphibious transport dock ship USS Green Bay as the ships steam in formation in the Pacific Ocean July 21, 2012. Peleliu and Green Bay were under way participating in a composite training unit exercise in preparation for a scheduled deployment.