
Hospital ships have been used by the US Navy since at least 1798, with the first purpose-built hospital ship, the USS Relief, commissioned in 1921. The US Navy currently has two dedicated hospital ships, the USNS Mercy and the USNS Comfort, which are used to provide emergency care for American combatant forces, as well as support disaster relief and humanitarian operations worldwide. These ships are equipped with 12 fully-equipped operating rooms, a 1,000-bed hospital facility, 88 ICU beds, and 11 isolation ward beds. In addition to these two large hospital ships, the US Navy also has a new class of expeditionary medical ships that are faster and more agile, with the first ship in this class named the USNS Bethesda.
| Characteristics | Values |
|---|---|
| Number of US hospital ships | 2 |
| Names of the hospital ships | USNS Mercy, USNS Comfort |
| Location | The Comfort is layberthed in Norfolk, VA, and the Mercy in San Diego, CA |
| Use case | Provide on-site emergency care for American combatant forces, support disaster relief and humanitarian operations worldwide |
| Medical facilities | 12 fully-equipped ORs, a 1,000-bed hospital facility, 88 ICU beds, 11 isolation ward beds, radiological services, a 5,000-unit blood bank, a full medical laboratory, pharmacy and optometry labs, and two oxygen-producing plants |
| Historical examples | USS Haven (AH-12), USS Benevolence (AH-13), USS Tranquillity (AH-14), USS Consolation (AH-15), USS Repose (AH-16), USS Sanctuary (AH-17), USS Relief |
| Other ships with medical facilities | USS Bonhomme Richard (Wasp-class amphibious assault ship), Nimitz-class aircraft carrier, Gerald R. Ford-class aircraft carrier |
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What You'll Learn
- The US Navy currently has two dedicated hospital ships: the USNS Mercy and the USNS Comfort
- Hospital ships have been a part of the US Navy since at least 1798
- The US Navy has announced plans for a new class of expeditionary medical ship
- Hospital ships were first used on a large scale during World War I and World War II
- Many US Navy ships have on-board hospitals, but they are only a small part of the vessel's capabilities

The US Navy currently has two dedicated hospital ships: the USNS Mercy and the USNS Comfort
The US Navy has utilised hospital ships since at least 1798, with their special status recognised under the 1906 Geneva Convention and the 1907 Hague Convention. Hospital ships have been used for a variety of purposes, including ambulance vessels, rescue ships, and evacuation ships, as well as serving dual roles such as barracks or supply ships.
The USNS Mercy, based in San Diego, California, has been deployed to provide medical support during the COVID-19 pandemic, assisting local healthcare providers by treating patients without the virus and helping to free up local medical facilities for COVID-19 patients. The ship has also been involved in the Pacific Partnership in 2016, providing medical services in the Philippines.
The USNS Comfort, based in Norfolk, Virginia, has also been deployed to provide medical support during the COVID-19 pandemic. Both ships are vital assets in the US Navy's ability to provide emergency medical care and humanitarian assistance worldwide.
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Hospital ships have been a part of the US Navy since at least 1798
The US Navy currently has two dedicated hospital ships: the USNS Mercy and the USNS Comfort. Both ships are equipped with 12 fully-equipped operating rooms, a 1,000-bed hospital facility, 88 ICU beds, 11 isolation ward beds, radiological services, a 5,000-unit blood bank, a full medical laboratory, a pharmacy, optometry labs, and two oxygen-producing plants. These ships are kept in a constant state of readiness to provide emergency care for American combatant forces and support disaster relief and humanitarian operations worldwide.
In addition to these dedicated hospital ships, the US Navy also has other ships with medical capabilities, such as the USS Bonhomme Richard, a Wasp-class amphibious assault ship that can act as a light aircraft carrier. During the COVID-19 pandemic, the US Navy deployed the USNS Mercy and USNS Comfort to provide medical support to Americans in affected regions, assisting local healthcare providers by offering care to those without the virus and freeing up resources for COVID-19 patients.
The US Navy has announced plans for a new class of expeditionary medical ships, with the first ship named the USNS Bethesda, which will be faster and more agile than the current large hospital ships in the fleet. This new ship will be better suited for the intense combat situations expected in the coming years, marking a continuation of the long history of hospital ships in the US Navy.
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The US Navy has announced plans for a new class of expeditionary medical ship
The US Navy has a long history of using hospital ships, dating back to at least 1798. These ships have played a crucial role in providing medical care and support during times of conflict and peace. During World War I and World War II, the US Navy utilized hospital ships on a massive scale, with the first purpose-built hospital ship, the USS Relief, being commissioned in 1921.
Today, the US Navy currently operates two dedicated hospital ships: the USNS Mercy and the USNS Comfort. These ships are kept ready to deploy at all times, providing emergency care for American forces during combat operations and supporting disaster relief and humanitarian missions worldwide during peacetime. Both ships are equipped with 12 fully-equipped operating rooms, a 1,000-bed hospital facility, including 88 ICU beds, radiological services, a full medical laboratory, and a 5,000-unit blood bank.
However, the US Navy has recognized the need for a new class of expeditionary medical ships. On May 12, Secretary of the Navy, Carlos Del Toro, announced the addition of the USNS Bethesda to the fleet. This ship is designed to be faster and more agile than the current large hospital ships, making it better suited for the close-quarters and intense combat situations expected in future conflicts. The USNS Bethesda will be the Navy's first medical ship in 35 years and is expected to be a state-of-the-art addition to the fleet.
The USNS Bethesda will join a long line of expeditionary medical ships that have served the US Navy with distinction. These ships, often converted from other purposes, have provided invaluable medical support and saved countless lives. The new ship will carry on this tradition of service and innovation, ensuring that the US Navy is well-equipped to handle the medical challenges of the future. The USNS Bethesda is expected to set sail in the coming years, joining the USNS Mercy and USNS Comfort in their vital missions.
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Hospital ships were first used on a large scale during World War I and World War II
The use of hospital ships has been part of the United States Navy since at least 1798. However, the large-scale deployment of these vessels occurred during World War I and World War II. During these conflicts, numerous passenger liners were converted into hospital ships, providing essential medical support for wounded soldiers. The British Royal Navy, for instance, operated 77 such ships by the end of World War I. Unfortunately, many hospital ships were attacked and sunk during World War I, often becoming targets due to the large number of injured personnel they carried.
The United States Navy also utilised hospital ships during these wars. Examples of US Navy hospital ships from this period include the USS Haven, USS Benevolence, and USS Repose. The USS Relief, commissioned in 1921, was the first purpose-built hospital ship in the US Navy.
Hospital ships played a crucial role in evacuating and treating wounded soldiers during battles. They served as receiving ships, providing initial care before transferring patients to tertiary facilities for further treatment. The large-scale use of hospital ships continued into World War II, with Canada operating vessels such as the RMS Lady Nelson and SS Letitia (II).
Today, the US Navy maintains this tradition with two dedicated hospital ships: the USNS Mercy and USNS Comfort. These ships are always ready for deployment and provide emergency medical care to American combatant forces. They are also used for disaster relief and humanitarian missions worldwide when not needed for combat operations. The USNS Mercy, for instance, provided crucial support during the COVID-19 pandemic, assisting local healthcare providers and treating patients without the virus to ease the burden on hospitals treating COVID-19 cases.
While the US Navy currently has only two dedicated hospital ships, many of their other vessels possess medical capabilities. For instance, the USS Bonhomme Richard, a Wasp-class amphibious assault ship, could act as a light aircraft carrier and provide emergency stabilisation surgery for wounded servicemembers. Additionally, the US Navy has announced plans for a new class of expeditionary medical ships, with the first being named the USNS Bethesda, designed to be faster and more agile in intense combat situations.
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Many US Navy ships have on-board hospitals, but they are only a small part of the vessel's capabilities
Hospital ships have been a part of the United States Navy since at least 1798. Their status is internationally recognised under the second Geneva Convention of 1906 and the Hague Convention of 1907. The first purpose-built hospital ship in the U.S. Navy was the USS Relief, commissioned in 1921. Today, the U.S. Navy has two dedicated hospital ships: the USNS Mercy and the USNS Comfort. Both are kept ready to deploy and provide emergency care for American combatant forces. When not in use for combat operations, they are used for disaster relief and humanitarian operations worldwide.
Many U.S. Navy ships have on-board hospitals, but they are only a small part of the vessel's overall capabilities. These ships are primarily used for the ship's crew and its amphibious forces, and occasionally for relief missions. A warship with hospital facilities does not have the protected status of a hospital ship. Examples of U.S. naval ships with on-board hospitals include the Gerald R. Ford-class aircraft carrier, which has a full lab, pharmacy, operating room, 3-bed intensive care unit, 2-bed emergency room, and 41-bed hospital ward, staffed by 11 medical officers and 30 hospital corpsmen. The Nimitz-class aircraft carrier acts as the hospital ship for the entire carrier strike group, with a 53-bed hospital ward and a three-bed ICU. The Wasp-class amphibious assault ship has six operating rooms, 14 ICU beds, 46 hospital beds, four battle dressing stations, medical imaging capabilities, a fully functional laboratory, and a blood bank. It can expand its medical capacity to 600 beds, making it the second-largest hospital at sea.
The Spearhead-class Expeditionary Fast Transport has a "Limited Medical Mission" role, with a combined forward resuscitative care capability, a limited intensive care unit, and a medical ward. The San Antonio-class amphibious transport dock has 24 hospital beds, while the Harper's Ferry-class dock landing ship has 11, and the Whidbey Island-class dock landing ship has 8. The new Bethesda-class expeditionary medical ship will have four operating rooms and 124 medical beds, separated into acute care, acute isolation, ICU, and ICU isolation spaces.
In addition to dedicated hospital ships, the U.S. Navy has used various other vessels for medical purposes, including ambulance boats, rescue ships, evacuation ships, barracks ships, receiving ships, supply ships, and guard ships. These vessels have been used for the treatment and transport of wounded soldiers, as well as for providing primary care and support during times of conflict and peace.
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Frequently asked questions
The U.S. Navy currently has two dedicated hospital ships: the USNS Mercy and the USNS Comfort.
Hospital ships are used for the treatment of wounded soldiers fighting on land, as well as for evacuation and transport of patients after primary care has been given. They are also used for disaster relief and humanitarian operations worldwide.
The USNS Mercy and USNS Comfort each house 12 fully-equipped operating rooms, a 1,000-bed hospital facility, 88 ICU beds, 11 isolation ward beds, radiological services, a 5,000-unit blood bank, a full medical laboratory, pharmacy and optometry labs, and two oxygen-producing plants.
Many naval ships have on-board hospitals, including aircraft carriers and amphibious assault ships. The Gerald R. Ford-class aircraft carrier has a full lab, pharmacy, operating room, 3-bed intensive care unit, 2-bed emergency room, and 41-bed hospital ward. The Wasp-class amphibious assault ship has 6 operating rooms, 14 ICU beds, 46 hospital beds, 4 battle dressing stations, medical imaging, a fully functional laboratory, and a blood bank.
Yes, there have been many historical US hospital ships. One example is the USS Repose, which was in service from 1945-1950, 1950-1954, and 1965-1970. The USS Sanctuary was also in service from 1945-1946, 1966-1971, and 1972-1975. The first purpose-built US Navy hospital ship was the USS Relief, commissioned in 1921.






































