A typical U.S. Amphibious Readiness Group consists of: * One amphibious assault ship (LHA or LHD): the primary landing ship, resembling a small aircraft carrier, designed to transport troops into the war zone by air using transport helicopters. In a secondary role, these ships perform sea control and limited power projection missions using AV-8B Harrier II aircraft and anti-submarine helicopters. * One amphibious transport dock ship (LPD): a warship that transports troops into the war zone by sea, primarily using conventional landing craft and Landing Craft Air Cushion hovercraft (LCAC), although they also have the capability of operating helicopters from their flight decks as well. * One dock landing ship (LSD): a warship supporting amphibious operations including landings o