Background: Amphibious warships are uniquely designed to support assault from the sea against defended positions ashore. They must be able to sail in harm's way and provide a rapid built-up of combat power ashore in the face of opposition. The United States maintains the largest and most capable amphibious force in the world. The Wasp-class are the largest amphibious ships in the world. The lead ship, USS Wasp (LHD 1), was commissioned in July 1989 in Norfolk, Va.