Mercy-class hospital ship

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Mercy-class hospital ship
USNS Mercy
USNS Mercy in 2012
Class overview
Name: Mercy class
Builders: National Steel and Shipbuilding Company
Operators:  United States Navy
Preceded by: Haven-class hospital ship
Built: 1974–1976 as San Clemente-class oil tanker
In commission: 1986–present
Completed: 2
Active: 2
General characteristics
Type: Hospital ship
Displacement: 69,360 long tons (70,473 t)
Length: 894 ft (272 m)
Beam: 105 ft 7 in (32.18 m)
Propulsion: Two boilers, two GE turbines, one shaft, 24,500 hp (18 MW)
Speed: 17.5 knots (32.4 km/h; 20.1 mph)
  • 12 civilian and 58 military during Reduced Operating Status
  • 61 civilian and 1,214 military during Full Operating Status
Time to activate: 76 hours
  • Multiple crew served machine gun mounts[1]
  • Small arms
Aviation facilities: Helicopter landing deck

The Mercy class of hospital ships are converted San Clemente-class supertankers used by the United States Navy. Originally built in the 1970s by the National Steel and Shipbuilding Company, they were acquired by the Navy and converted into hospital ships, coming into service in 1986 and 1987.[2]

Mercy class replaced the Haven-class hospital ships.

The ships are operated by Military Sealift Command and are designed to provide emergency, on-site care for American combatant forces, and also for use in support of disaster relief and humanitarian operations. Each ship contains 12 fully equipped operating theaters, a 1,000-bed hospital facility, radiological services, medical laboratory, pharmacy, optometry lab, CAT scan and two oxygen-producing plants.[2]


Two ships of the class were put into service:


Stationed in San Diego, Calif., Mercy primarily operates in the Pacific and Indian Oceans. Her inaugural mission in 1987 was a humanitarian cruise to the Philippines and South Pacific. Her first military mission was serving coalition troops in the First Gulf War. The first disaster relief came in the wake of the 2004 tsunami as Operation Unified Assistance. Her latest was in 2013, when she came to the aid of the Philippines and other nations in the aftermath of Typhoon Haiyan.

Stationed out of Norfolk, Va., Comfort operates primarily in the Caribbean and Latin America. Her first mission was a combat one: serving coalition troops off the coast of Kuwait during Operation Desert Storm. Her first humanitarian missions both happened in 1994, helping Haitian and Cuban immigrants looking to come to America. In the aftermath of 9/11, Comfort was activated and sent to Manhattan to provide medical and mental services. Comfort headed into combat again for Operation Iraqi Freedom. In 2005 she was back saving American citizens following the devastation of Hurricane Katrina. In 2010 she undertook another disaster relief mission, in response to the Haiti earthquake.[4] In May 2015, Comfort was in Kingston, Jamaica providing medical services including optometry, dentistry, general medical, women’s health, pediatrics, and pharmacy. The Jamaica leg was part of ‘Continuing Promise’, a nearly six-month humanitarian mission across the Caribbean region.[5] Once again in 2017, Comfort was deployed to aid American citizens in Puerto Rico after Hurricane Maria.[6]


The Mercy-class ships are large, with 1,000 beds, and can receive up to 200 patients a day. They are stable platforms suitable for performing most surgical procedures in various sea conditions. However, the main points of criticism of these ships are:[2]

  • They are too slow, with a maximum speed of just over 17 knots. The Mercy class ships are much larger (in terms of medical capacity) than is needed for most military operations, and they are not easily or quickly deployed or docked. Their size gives them a substantial radar signature that, combined with lack of maneuverability, makes them vulnerable to attack. In theory, this should never occur, as attacking a hospital ship is a war crime under the Hague Convention of 1907, but the ships are left vulnerable to terrorist organizations and other entities that do not follow such established warfare conventions, due to the fact that both ships are outfitted only with defensive weapons.
  • While the ships are underway or in rough seas patients must be transported by helicopter. However, helicopter capacities are limited, as each ship has only one landing pad.
  • Patient movement within the ship is limited. Built as oil tankers, the original oil storage bulkheads were retained, but have no hatches, which means that patients must be brought up to the top deck in order to be moved from a lower compartment in one part of the ship to another.

In mid-2004 Vice Admiral Michael L. Cowan, the Surgeon General and chief of the Bureau of Medicine and Surgery, said that the Comfort and Mercy should be retired. "They’re wonderful ships, but they’re dinosaurs. They were designed in the ’70s, built in the ’80s, and frankly, they’re obsolete".[2]

Few, if any, options are presently being explored to replace them with a platform better suited to the mission at this time.

See also[edit]


  1. ^ "MSC 2005 in Review Home › Publications › Annual Report › 2005 › Appendix". Retrieved 12 January 2018. MSC ships need force protection, which is provided by embarked security teams. The ESTs defend against terrorists and pirates by using automatic weapons, such as this M-240 light machine gun mounted on the rail of MSC hospital ship USNS Mercy while she was underway in support of Operation Unified Assistance.
  2. ^ a b c d "Mercy class hospital ships". Retrieved 18 September 2010.
  3. ^ "USNS Comfort (T-AH-20) - History, Specs and Pictures - Navy Warships and Submarines". Retrieved 2016-11-03.
  4. ^ "Navy Hospital Ships- USNS Mercy & USNS Comfort :". Retrieved 2016-09-29.
  5. ^ "United States Naval Ship Comfort, a Mercy-class hospital ship, Provides Medical Services during its May 2015 visit to Jamaica - Jamaica Information Service". Jamaica Information Service. 2015-05-22. Retrieved 2016-10-27.
  6. ^ "USNS Comfort leaves for Puerto Rico". Retrieved 2017-10-12.