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An amphibious assault ship is a type of warship employed to land and support ground forces on enemy territory during an armed conflict. [1] The design evolved from aircraft carriers converted for use as helicopter carriers (which, as a result, are often mistaken for conventional fixed-wing aircraft carriers). Modern designs support amphibious landing craft, with most designs including a well deck. Like the aircraft carriers they were developed from, some amphibious assault ships also support V/STOL fixed-wing aircraft and have a secondary role as aircraft carriers. [2] [3]
The role of the amphibious assault ship is fundamentally different from that of a standard aircraft carrier: its aviation facilities have the primary role of hosting helicopters to support forces ashore rather than to support strike aircraft. However, some are capable of serving in the sea-control role, embarking aircraft like Harrier or the new F-35B variant of the Lightning II fighters for combat air patrol and helicopters for anti-submarine warfare or operating as a safe base for large numbers of STOVL fighters conducting air support for an expeditionary unit ashore. Most of these ships can also carry or support landing craft, such as air-cushioned landing craft (hovercraft) or LCUs.
The largest fleet of these types is operated by the United States Navy, including the Wasp class dating back to 1989 and the very similar America-class ships that entered service in 2014. Just as an aircraft carrier leads a carrier strike group in the US Navy, an amphibious assault ship leads an expeditionary strike group. Amphibious assault ships are also operated by the Chinese People's Liberation Army Navy, the Royal Navy, the French Navy, the Italian Navy, the Spanish Navy, the Royal Australian Navy, the Brazilian Navy, the Egyptian Navy, the Republic of Korea Navy (South Korea) and the Turkish Naval Forces.
The term amphibious assault ship is often used interchangeably with other ship classifications. It applies to all large-deck amphibious ships such as the landing platform helicopter (LPH), landing helicopter assault (LHA), and landing helicopter dock (LHD). [4]
In the Pacific theater of World War II, escort carriers would often escort the landing ships and troop carriers during the island-hopping campaign. In this role, they would provide air cover for the troopships as well as fly the first wave of attacks on the beach fortifications in amphibious landing operations. On occasion, they would even escort the large carriers, serving as emergency airstrips and providing fighter cover for their larger sisters while these were busy readying or refueling their own planes. They would also transport aircraft and spare parts from the US to the remote island airstrips.
The Imperial Japanese Army had its own special army ships being similar to aircraft carriers of the Imperial Japanese Navy: they were landing craft carriers that carried both landing craft and aircraft, and the plan was to launch the aircraft at the same time as the landing crafts carrying the troops, and to use them for combat air patrol, aerial reconnaissance and close air support. [5] First, Shinshū Maru (神州丸 or 神洲丸), completed in 1934 as the world's first purpose-built landing ship, [6] was designed to launch aircraft, but it did not have the facilities for landing. Its successor, the Akitsu Maru (あきつ丸), completed in 1942, had a full-length flight deck in addition to the floodable well deck, making it more like a full-fledged aircraft carrier. However, the Japanese were already in a state of defeat, and the ship was eventually not used as an aircraft carrier until it was sunk in the fall of 1944. [5] With the deployment of the 8,000-ton Shinshū Maru and a further refinement, the 9,000-ton Akitsu Maru (1941), the Japanese amphibious forces had in hand prototypes for all-purpose amphibious ships. Today the U.S. Navy and Marines use this fundamental concept to the exclusion of all others in their LHA and LHD class amphibious assault carriers. [7] In 1937, British and American observers watched Shinshū Maru at work off Shanghai and immediately recognized a significant development in amphibious warfare. Shinshū Maru carried landing craft in a well deck that could be flooded, which allowed the landing craft to float free from an open stern gate. The ship could also hold additional craft on davits, but her next most impressive function was an ability to discharge vehicles from a deck-level parking garage directly onto a pier. The ship also carried two catapults for aircraft but did not embark operational seaplanes. She could, however, transport and unload aircraft if necessary, a capability further developed with Akitsu Maru, which even had a short take-off flight deck. [8]
Despite all the progress that was seen during World War II, there were still fundamental limitations in the types of coastline that were suitable for assault. Beaches had to be relatively free of obstacles, and have the right tidal conditions and the correct slope. However, the development of the helicopter fundamentally changed the equation. The first use of helicopters in an amphibious assault came during the invasion of Egypt during the Suez War in 1956. In this engagement, two British light fleet carriers, Ocean and Theseus, were converted to perform a battalion-size airborne assault with helicopters.
The techniques were developed further by American forces during the Vietnam War and refined during training exercises. The modern amphibious assault can take place at virtually any point of the coast, making defending against them extremely difficult.
Most early amphibious assault ships were converted from small aircraft carriers. As well as the two Colossus-class light aircraft carriers converted for use in the Suez War, the Royal Navy converted the Centaur-class carriers Albion and Bulwark into "commando carriers" during the 1950s. [9] Their sister ship HMS Hermes was also converted to a commando carrier in the early 1970s, but was restored to aircraft carrier operations before the end of the 1970s.
In the early 1950s the United States Navy and Marine Corps tested the concept of airborne amphibious operations from aircraft carriers. In 1955 the Casablanca-class escort carrier USS Thetis Bay was converted to an assault helicopter carrier (CVHA-1), ultimately re-designated LPH-6 in 1959. [10] Thetis Bay did not fully meet the Marine Corps requirements so three Essex-class aircraft carriers; Boxer, Princeton, and Valley Forge, which had greater aircraft capacity, longer range, and higher speed were converted to helicopter carriers as LPH-4, LPH-5, and LPH-8 between 1959 and 1961. They are sometimes referred to as the Boxer class after the lead ship in the series. [11] These provided a valuable interim during the construction from 1959 to 1970 of the full complement of seven new Iwo Jima-class ships designed specifically for the landing platform helicopter role.
Later amphibious assault craft were constructed for the role. The United States Navy constructed the Tarawa class of five landing helicopter assault ships, which began to enter service from the late 1970s, and the Wasp class of eight landing helicopter dock ships, the first of which was commissioned in 1989. The United States Navy is also designing a new class of assault ships: the first America-class ship entered service in October 2014. [12]
The first British ship to be constructed specifically for the amphibious assault role was HMS Ocean, which was commissioned into the Royal Navy in 1998. Other nations have built amphibious assault ships; the French Mistral class, South Korea's ROKS Dokdo, and Spain's Juan Carlos I are all currently active, while Australia and Turkiye has two Canberra-class and one Anadulu-class ships respectively, all based on the Spanish design.
Most modern amphibious assault ships have a well deck (docking well), allowing them to launch landing craft in rougher seas than a ship that has to use cranes or a stern ramp. The US Navy hull classification symbols differ among these vessels, depending on, among other things, their facilities for aircraft: a modern landing ship dock (LSD) has a helicopter deck, a landing platform dock (LPD) also has a hangar, and a landing helicopter dock (LHD) or landing helicopter assault (LHA) has a full-length flight deck with internal aviation facilities for both rotary and fixed wing craft below deck. [13]
Due to their aircraft carrier heritage, all amphibious assault ships resemble aircraft carriers in design. The flight deck is used to operate attack and utility helicopters for landing troops and supplies and on some ship types also launch and recover fixed wing aircraft such as V/STOL Harrier "jump jet"s or F-35Bs to provide air support to landing operations. STOL aircraft such as the North American Rockwell OV-10 Bronco were sometimes deployed on large-deck amphibious assault ships and were able to perform short take-offs and landings without needing catapults or arresting wires, although for safety and clearance reasons landings were most often not permitted. [14] Landing craft are also carried, either on deck-mounted davits, or in an internal well dock (USN: "well deck").
An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the capital ship of a fleet, as it allows a naval force to project air power worldwide without depending on local bases for staging aircraft operations. Carriers have evolved since their inception in the early twentieth century from wooden vessels used to deploy balloons to nuclear-powered warships that carry numerous fighters, strike aircraft, helicopters, and other types of aircraft. While heavier aircraft such as fixed-wing gunships and bombers have been launched from aircraft carriers, these aircraft have not landed on a carrier. By its diplomatic and tactical power, its mobility, its autonomy and the variety of its means, the aircraft carrier is often the centerpiece of modern combat fleets. Tactically or even strategically, it replaced the battleship in the role of flagship of a fleet. One of its great advantages is that, by sailing in international waters, it does not interfere with any territorial sovereignty and thus obviates the need for overflight authorizations from third-party countries, reduces the times and transit distances of aircraft and therefore significantly increases the time of availability on the combat zone.
The Tarawa class is a ship class of Landing Helicopter Assault (LHA) type amphibious assault ships operated by the United States Navy (USN). Five ships were built by Ingalls Shipbuilding between 1971 and 1980; another four ships were planned, but later canceled; instead they were joined by the Wasp-class amphibious assault ships.
The Wasp-class is a class of landing helicopter dock (LHD) amphibious assault ships operated by the United States Navy. Based on the Tarawa class, with modifications to operate more advanced aircraft and landing craft, the Wasp-class is capable of transporting almost the full strength of a United States Marine Corps Marine Expeditionary Unit (MEU), and landing them in hostile territory via landing craft or helicopters as well as providing air support via AV-8B Harrier II attack aircraft or F-35B Lightning II stealth strike-fighters. All Wasp-class ships were built by Ingalls Shipbuilding, at Pascagoula, Mississippi, with the lead ship, USS Wasp, commissioned on 29 July 1989. Eight Wasp-class ships were built, and as of April 2021, seven are in active service, as USS Bonhomme Richard was seriously damaged by fire on 12 July 2020, and subsequently decommissioned in April 2021.
Landing platform helicopter (LPH) is a term used by some navies to denote a type of amphibious warfare ship designed primarily to operate as a launch and recovery platform for helicopters and other VTOL aircraft. As such, they are considered a type of helicopter carrier.
A dock landing ship is an amphibious warfare ship with a well dock to transport and launch landing craft and amphibious vehicles. Some ships with well decks, such as the Soviet Ivan Rogov class, also have bow doors to enable them to deliver vehicles directly onto a beach. Modern dock landing ships also operate helicopters.
A landing helicopter dock (LHD) is a multipurpose amphibious assault ship that is capable of operating as a helicopter carrier and also has a well deck for supporting landing crafts. LHD vessels are built with a full flight deck similar in appearance to a light aircraft carrier to operate VTOL rotorcrafts such as utility and attack helicopters, and can also support tiltrotor aircraft and VSTOL fixed-wing aircraft. Some future designs might even support CATOBAR operations for light aircraft and UCAVs via aircraft catapults and arresting gears.
Landing helicopter assault (LHA) is the United States Navy's hull classification symbol for the general-purpose helicopter-carrying amphibious assault ships of the Tarawa and America classes.
An amphibious ready group (ARG) of the United States Navy consists of a naval element—a group of warships known as an Amphibious Task Force (ATF)—and a landing force (LF) of U.S. Marines, in total about 5,000 people. Together, these elements and supporting units are trained, organized, and equipped to perform amphibious operations.
An anti-submarine warfare carrier is a type of small aircraft carrier whose primary role is as the nucleus of an anti-submarine warfare hunter-killer group. This type of ship came into existence during the Cold War as a development of the escort carriers used in the ASW role in the North Atlantic during World War II.
Juan Carlos I is a multi-purpose aircraft carrier-landing helicopter dock (LHD) in the Spanish Navy. Similar in role to many aircraft carriers, the amphibious landing ship has a ski jump for STOVL operations, and is equipped with the McDonnell Douglas AV-8B Harrier II attack aircraft. The vessel is named in honour of Juan Carlos I, the former king of Spain.
A joint support ship (JSS) is a multi-role naval vessel capable of launching and supporting joint amphibious and airlift operations. It can also provide command and control, sealift and seabasing, underway replenishment, disaster relief and logistics capabilities for combined land and sea operations.
A helicopter carrier is a type of aircraft carrier whose primary purpose is to operate helicopters. It has a large flight deck that occupies a substantial part of the deck, which can extend the full length of the ship like HMS Ocean of the Royal Navy (RN), or extend only partway, usually aft, as in the Soviet Navy's Moskva class or in the Chinese Navy's Type 0891A. It often also has a hangar deck for the storage and maintenance of rotorwing aircraft.
The America class is a ship class of landing helicopter assault (LHA) type amphibious assault ships of the United States Navy (USN). The class is designed to put ashore a Marine Expeditionary Unit using helicopters and MV-22B Osprey V/STOL transport aircraft, supported by AV-8B Harrier II or F-35 Lightning II V/STOL aircraft and various attack helicopters. The first of these warships was commissioned by the U.S. Navy in 2014 to replace USS Peleliu of the Tarawa class; as many as eleven will be built. The design of the America class is based on that of USS Makin Island, the last ship of the Wasp class, but the "Flight 0" ships of the America class will not have well decks, and have smaller on-board hospitals to provide more space for aviation uses.
In the United States Navy, the expeditionary strike group (ESG) is a coordinated group of surface ships, aircraft, submarines, and other naval assets. In contrast to carrier strike groups (CSGs), which emphasize air power and are led by a supercarrier, ESGs are strongly suited for amphibious warfare and are led by an amphibious assault ship. The ESG concept was introduced in the early 1990s, based on the Naval Expeditionary Task Force. The U.S. Navy fields nine expeditionary strike groups.
An amphibious warfare ship is an amphibious vehicle warship employed to land and support ground forces, such as marines, on enemy territory during an amphibious assault.
Akitsu Maru (あきつ丸) was a Japanese "Type C" landing craft depot ship and escort aircraft carrier operated by the Imperial Japanese Army (IJA). In some sources Akitsu Maru and Nigitsu Maru are also considered to be the first amphibious assault ships, althou, this title can be disputed with Shinshū Maru that served a similar role, and being a template for Akitsu Maru.
Shinshū Maru was a ship of the Japanese Imperial Army during World War II. She was the world's first landing craft carrier ship to be designed as such, and a pioneer of modern-day amphibious assault ships. During some of her operations, she was known to have used at least four cover names, R1, GL, MT, and Ryujo Maru.
Landing craft carriers or landing craft depot ships were an innovative type of amphibious warfare ship developed by the Imperial Japanese Army during World War II. The prototype was developed in secrecy under the pseudonyms Ryujo Maru and Fuso Maru using features later adopted by other navies for dock landing ships and amphibious transport docks. Additional ships were built after combat experience validated the concept, but most were completed after the Japanese invasions of the early war, and used primarily as troopships during later operations. Today's amphibious assault ships bear a strong similarity to this concept.
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