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| Dock Landing Ship (LSD) | |
|---|---|
| Name | Dock Landing Ship |
| Type | Amphibious warfare ship |
Dock Landing Ship (LSD) A Dock Landing Ship is an amphibious warfare vessel designed to transport, launch, and recover landing craft, amphibious vehicles, and troops using an internal well deck. Originating in the United States Navy during the World War II era, the class has influenced designs used by the Royal Navy, French Navy, People's Liberation Army Navy, Indian Navy, and other Royal Australian Navy and Republic of Korea Navy operators. LSDs have participated in major operations such as the Battle of Normandy, Korean War, Vietnam War, Falklands War, Gulf War, Iraq War, and Operation Enduring Freedom.
LSD designs emphasize a floodable well deck, large stern gate, and heavy vehicle stowage to support Amphibious assaults, United States Marine Corps expeditionary forces, Royal Marines contingents, and joint task forces. Typical characteristics include a boxlike hull form derived from Landing Ship, Tank (LST) development, diesel or steam propulsion inspired by Liberty ship and Cammell Laird engineering, and heavy ballast systems similar to those used on submersible vessels. Internal arrangements balance vehicle ramps, vehicle decks, and troop accommodations to support embarked units such as 1st Marine Division, 3 Commando Brigade, and Indian Army amphibious elements. Survivability features often incorporate compartmentalization from HMS Centaur, damage-control doctrines from US Navy training, and radar cross-section reductions influenced by Stealth ship research.
The LSD concept evolved from prewar experiments in landing craft and dock-type transports like HMS Fearless (1896) and American USS Ashland (1919), accelerated by the strategic demands of Operation Torch and Operation Overlord. The United States built the first purpose-designed LSDs such as the USS Ashland (LSD-1) class during World War II to support Amphibious Corps operations in the Pacific War and European Theatre. Postwar developments reflected lessons from the Korean War and Suez Crisis, leading to enlarged designs exemplified by Thatcher-class and Casa Grande-class derivatives. Cold War requirements tied LSD evolution to NATO planning, SEATO exercises, and power projection during crises like the Suez Crisis and Cuban Missile Crisis.
LSDs serve as central elements in Amphibious Ready Groups, expeditionary strike groups, and humanitarian assistance missions following disasters such as 2004 Indian Ocean earthquake and tsunami and Hurricane Katrina. They launch Landing Craft Air Cushions, Landing Craft Utility, and tracked amphibious vehicles like the AAVP7A1 to conduct beach landings, over-the-horizon assaults, and littoral operations supporting units including United States Marine Corps and South Korean Marine Corps. Beyond assault roles, LSDs undertake sea-basing for Special Operations Forces, casualty evacuation in concert with Hospital Ships, and logistics support for International Security Assistance Force rotations.
Major classes include Ashland-class dock landing ship, Casa Grande-class dock landing ship, Thomaston-class, Whidbey Island-class, and Harpers Ferry-class in United States Navy service; Fearless-class landing ship dock and Albion-class landing platform dock in the Royal Navy; Foudre-class and Mistral-class influences in the French Navy and Russian Navy adaptations; and Type 071 amphibious transport dock hybrids appearing in the People's Liberation Army Navy. Variants differ in well-deck dimensions, vehicle stowage, aviation facilities influenced by Sea Harrier operations, and defensive suites derived from Phalanx CIWS and SeaRAM installations.
LSD armament historically included medium-caliber guns influenced by 5"/38 caliber gun mounts and close-in weapon systems like the Phalanx CIWS or Goalkeeper CIWS for point defense. Sensor suites often integrate navigation radars from Raytheon and air/surface search systems derived from AN/SPS-49 or SMART-S, alongside electro-optical trackers used by Royal Australian Navy. Aviation facilities vary: some LSDs carry a full-size flight deck to operate helicopters such as the CH-53E Super Stallion, Westland Sea King, and NH90, while others support limited aviation detachments for MV-22 Osprey tiltrotor trials and unmanned aerial systems flown by US Marine Corps aviation units.
Modernization programs have retrofitted LSDs with updated command-and-control suites interoperable with NATO networks, embarked medical facilities modeled on Hospital Ship USNS Comfort (T-AH-20), and modular mission bays following Littoral Combat Ship modularity concepts. Upgrades include installation of combat management systems from Lockheed Martin or Thales, propulsion improvements influenced by COGAG and CODAG architectures, and defensive enhancements using Rolling Airframe Missile and SeaRAM integrations. Midlife refits extend hull service life in line with USN lifecycle management and shipyard programs at Ingalls Shipbuilding and Bath Iron Works.
LSDs have been operated by navies including the United States Navy, Royal Navy, French Navy, Royal Australian Navy, Indian Navy, Republic of Korea Navy, Italian Navy, Spanish Navy, Brazilian Navy, and People's Liberation Army Navy. Notable service histories include USS Ashland (LSD-1) in World War II, USS Westchester County (LST-1167) in Vietnam War operations, HMS Fearless (L10) during the Falklands War, and modern deployments of Whidbey Island-class and Harpers Ferry-class ships in Operation Iraqi Freedom and Operation Enduring Freedom. Many retired LSDs have been transferred under programs like Foreign Military Sales and Excess Defense Articles to allied navies, while newer designs continue to evolve in response to contemporary expeditionary requirements.
Category:Amphibious warfare vessels