The Military Sealift Command (MSC) is an organization that controls the replenishment and military transport ships of the United States Navy. Military Sealift Command has the responsibility for providing sealift and ocean transportation for all US military services as well as for other government agencies. It first came into existence on 9 July 1949 when the Military Sea Transportation Service (MSTS) became solely responsible for the Department of Defense's ocean transport needs. The MSTS was renamed the Military Sealift Command in 1970.
USNS Yukon (T-AO-202) is a Henry J. Kaiser-class underway replenishment oiler operated by the Military Sealift Command to support ships of the United States Navy.
USNS Mizar (MA-48/T-AGOR-11/T-AK-272) was a vessel of the United States Navy. She was named after the star Mizar.
USNS Stalwart (T-AGOS-1) was a Modified Tactical Auxiliary General Ocean Surveillance Ship and the lead ship of her class.
USNS Observation Island (T-AGM-23) was built as the Mariner-class merchant ship Empire State Mariner for the United States Maritime Commission, launched 15 August 1953, and operated by United States Lines upon delivery on 24 February 1954, making voyages for the Military Sea Transportation Service (MSTS) until going into reserve at Mobile, Alabama on 9 November 1954.
USNS Invincible (T-AGM-24), also known as ex-AGOS 10, is one of two tracking ships operated by the Military Sealift Command. One of the radars it carries is the Cobra Gemini dual band, X band and S band, radar.
USNS Vindicator (T-AGOS-3) was a United States Navy Stalwart-class modified tactical auxiliary general ocean surveillance ship that was in service from 1984 to 1993. Vindicator then served in the United States Coast Guard from 1994 to 2001 as the medium endurance cutter USCGC Vindicator (WMEC-3). From 2004 to 2020, she was in commission in the National Oceanic and Atmospheric Administration (NOAA) fleet as the oceanographic research ship NOAAS Hiʻialakai.
USNS Adventurous (T-AGOS-13) was a Stalwart-class modified tactical auxiliary general ocean surveillance ship of the United States Navy in service from 1988 to 1992. She was in non-commissioned service in the Military Sealift Command from 1988 to 1992, operating during the final years of the Cold War. She was transferred to the National Oceanic and Atmospheric Administration (NOAA) in 1992 and in 2003 was commissioned into service with NOAA as the fisheries research ship NOAAS Oscar Elton Sette.
USNS Titan (T-AGOS-15) was a Stalwart-class modified tactical auxiliary general ocean surveillance ship in service in the United States Navy from 1989 to 1993. From 1996 to 2014, she was in commission in the National Oceanic and Atmospheric Administration (NOAA) fleet as the oceanographic research ship NOAAS Ka'imimoana.
USNS Capable (T-AGOS-16) was a Stalwart-class modified tactical auxiliary general ocean surveillance ship of the United States Navy in service from 1989 to 2004. In 2008, she was commissioned into service in the National Oceanic and Atmospheric Administration as the oceanographic research ship NOAAS Okeanos Explorer.
USS Aeolus (ARC-3) began service as USS Turandot (AKA-47), an Artemis-class attack cargo ship built by the Walsh-Kaiser Co., Inc. of Providence, Rhode Island. In 1954 she was converted into a cable repair ship to support Project Caesar, the unclassified name for installation of the Sound Surveillance System SOSUS. Aeolus was the first of two ships, the other being USS Thor (ARC-4), to be converted into cable ships. Aeolus performed cable duties for nearly thirty years, from 1955 to 1973 as a commissioned ship and from 1973 until 1985 as the civilian crewed USNS Aeolus (T-ARC-3) of the Military Sealift Command (MSC). The ship was retired in 1985 and sunk as an artificial reef in 1988.
USNS Apache (T-ATF-172) was a U.S. Navy Powhatan-class fleet ocean tugboat that was operated by the Military Sealift Command (MSC) from 1981 to 2022. She spent the bulk of her career in the Atlantic and Mediterranean.
USNS Mohawk (T-ATF-170) was a United States Navy Powhatan-class tugboat operated by the Military Sealift Command from 1980 to 2005.
USNS Hayes (T-AGOR-16/T-AG-195) was a Hayes-class oceanographic research ship acquired by the United States Navy in 1971. In 1992 she was reconfigured as an acoustics research ship and assigned to the Navy's program of acoustic noise reduction for submarines.
USNS Victorious (T-AGOS-19) is a Victorious-class ocean surveillance ship which was acquired by the U.S. Navy in 1991 and assigned to the Military Sealift Command (MSC) Special Missions Program.
USNS Loyal (T-AGOS-22) is a Victorious-class ocean surveillance ship acquired by the U.S. Navy in 1993 and assigned to the Navy's Special Missions Program.
USNS Impeccable (T-AGOS-23) is an Impeccable-class ocean surveillance ship acquired by the U.S. Navy in 2001 and assigned to Military Sealift Command's Special Missions Program.
USNS Navajo (T-ATF-169) was a United States Navy Powhatan-class tugboat operated by the Military Sealift Command which was in service from 1980 to 2016. She spent the bulk of her career in the Pacific and is currently moored in Pearl Harbor, awaiting disposal.
USNS Sioux (T-ATF-171) was a United States Navy Powhatan-class tugboat operated by the Military Sealift Command (MSC). She was in service from 1981 to 2021 and spent the bulk of this time supporting the Pacific Fleet.
The United States Navy Combat Logistics Force (CLF), formerly the Naval Fleet Auxiliary Force (NFAF), is a subordinate component of the United States Navy's Military Sealift Command. CLF's 42 ships are the supply lines that provide virtually everything that Navy ships at sea needs to accomplish its missions, including fuel, food, ordnance, spare parts, mail and other supplies. NFAF ships enable the Navy fleet to remain at sea, on station and combat ready for extended periods of time. CLF ships also conduct towing, rescue and salvage operations or serve as floating medical facilities. All CLF ships are government owned and crewed by civil service mariners. Some of the ships also have a small contingent of Navy personnel aboard for operations support, supply coordination and helicopter operations.
United States
