Amphibious Ready Group

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See also: Expeditionary Strike Group

An Amphibious Ready Group (ARG) is an organization of amphibious warfare ships, landing craft, helicopters, and compatible fixed-wing aircraft, which carries a United States Marine Corps or Royal Marine unit capable of a variety of amphibious warfare and humanitarian assistance missions.

Ships of the ARG are armed for self-protection only. In the U.S. system, combining the ARG with a set of warships creates an Expeditionary Strike Group. The ARG also may operate with a Carrier Strike Group.

The usual combination has approximately 5,000 personnel. The ground component is commanded by a colonel, and the ships by a senior captain or commodore; the commodore may command the entire ARG.

In both U.K. and U.S. operations, additional, more general-purpose supply ships may follow the ARG. U.S. reinforcement will consist of a squadron of more of prepositioning ships, which may carry Air Force and Army supplies. Additional Marines fly in to a friendly airport and join up with the equipment on the MPS, possibly needing secure convoys to it. The MPS squadron may dock in a prepared port, or it may have to self-unload over a beach.

British capabilities are more ad hoc; in the Falklands War, a variety of "Ships Taken Up From Trade" (STUFT) transferred supplies, at sea, to the specialized amphibious ships.

Amphibious ships

With all the ship types, there are constant tradeoffs between at least four different storage constraints:

  • Flight deck and hangar deck two-dimensional space for aircraft and aircaft maintenance. Even there, there are tradeoffs between medium helicopters that carry troops and light equipment, heavy helicopters for heavy equipment, attack helicopters, short takeoff and vertical landing (STOVL) fighter aircraft, and now tilt-rotor transports.
  • Troop space, limited by berthing, feeding, and sometimes air conditioning
  • Well deck space for landing craft that go directly forward into the water, rather than being lowered from davits and embarked by climbing down ladders
  • Storage deck space for vehicles and other things that cannot stack, such as trucks and artillery pieces; there also have to be internal passageways or lifts to get the cargo to the aircraft or landing craft areas
  • Storage cubic space for stackable supplies, and also for equipment that is large in three dimensions, such artillery pieces.

These issues are not unique to the U.S. Navy; the Royal Navy also routinely sends out significant Marine task forces. Many lessons were learned in the Falklands War. Much also has been learned in continency operations from the sea, such as noncombat evacuation operations, and combat search and rescue (the Marine flavor called Tactical Recovery of Aircraft and Personnel).

U.S. types are described here, but there are close British equivalents:

  • An Amphibious Assault Ship (LHA or LHD) – Primary landing ships, resembling small aircraft carriers, designed to put troops on hostile shores. In a secondary role, using AV-8B Harrier aircraft and anti-submarine warfare helicopters, these ships perform sea control and limited power projection missions.
  • A Landing Platform Dock (LPD) Ship – Warships that embark, transport, and land elements of a landing force for a variety of expeditionary warfare missions.
  • A Landing Ship Dock (LSD) – Dock Landing Ships support amphibious operations including landings via Landing Craft Air Cushion (LCAC), conventional landing craft and helicopters, onto hostile shores.

Command and principal aircraft ship

The largest vessel in the ARG is an amphibious assault ship, of one of two types. They look like small aircraft carriers, but can only carry STOVL and VTOL aircraft.

LHA-5, USS Peleliu

In the Royal Navy, HMS Ocean is designated a "helicopter carrier" and would be the flagship of a large ARG. The Queen Elizabeth class ships under construction are true aircraft carriers, currently STOVL but designed to be convertible to CTOL ships; they would be more likely to be in a carrier group than as part of an ARG.

U.S. Navy versions have various designations; different generations have been known as amphibious transport dock (LHD)s, Landing assault ship (LHA)s, and Landing Platform Helicopter (LPH)s; the first two have well decks while an LPH does not.

In a secondary role, using Harrier aircraft and anti-submarine warfare helicopters, these ships perform sea control and limited power projection missions.

Dock Landing Ships

Dock Landing Ships (LSD) support amphibious operations including landings via Landing Craft Air Cushion (LCAC), conventional landing craft and helicopters, onto hostile shores. They are the most self-contained, so they can be sent on independent operation when a smaller force is needed. The three classes of U.S. LSDs are the

  • Harpers Ferry class
  • Whidbey Island class
  • Anchorage class

In the Royal Navy, the new ship type in this role is the Large Amphibious Landing Ships of the Bay class

The most distinctive aspect of this type of ship is that they contain a central "well deck" that can open to the sea, so conventional landing craft, as well as landing craft air cushion, can disembark and head for the landing area, fully loaded.

Ashore combat unit

This is a U.S. Marine Expedititionary Unit or Royal Marine Commando, which has organic air and logistics support for a ground combat element of battalion strength. It may be supplemented with other ground specialists, such as special operators from the United States Navy SEALs or UK Special Boat Service, tanks, engineers, intelligence specialists, etc.


Both the US and UK now use variants of the Harrier short takeoff and vertical landing aircraft, which provides close air support, limited anti-surface warfare, and, as demonstrated in the Falklands War, a significant air combat capability. Both countries expect to replace their Harrier types with the F-35B Lightning II.

Next comes the transport helicopters. There is a heavy vertical lift capability. The US uses CH-53 Sea Stallion helicopters while the UK uses CH-47 Chinooks. There are medium lift helicopters, such as the CH-46 Sea Knight or Wessex; the U.S. Marine Corps expects to replace these with MV-22 Osprey tilt-rotor aircraft.

There are scout and attack helicopters. The U.S. Marines use the AH-1 Cobra.