USNS SIOUX (T-ATF-171)
USNS SIOUX is one of seven ocean-going fleet tugs operated by the Navy's Military Sealift Command (MSC). The tugs are part of MSC's Naval Fleet Auxiliary Force operating in direct support of U.S. Navy fleets deployed around the world.
MSC tugs are used to tow ships, barges and targets for gunnery exercises. They are also used as platforms for salvage and diving work, as participants in naval exercises, to conduct search and rescue missions, to aid in the clean-up of oil spills and ocean accidents and to provide firefighting assistance.
The Sioux is homported in San Diego, Calif. and has a MILDET complement of four: An ITC/ITCS as OIC, IT1, ET1 and ET3.
History
The Sioux was delivered to the Navy in 1981 and is the sixth of the Powhatan class of ocean tugs. Features include a salvage and diving capability and modifications to allow a helicopter to hover over the deck while delivering or unloading supplies. Tugs of the Pohatan class are named after American Indian tribes. The Sioux for instance, is named after the Dakota Indians of North America, which occupy North and South Dakota. The tribe became known as the Sioux from a mispronounciation of an enemy tribe's word meaning "snake."

The Sioux has a crew of 17 civil service mariners and a military communication detachment of four U.S Navy personnel. All MSC ships are crewed and operated by civilian mariners.
The Sioux has received the Coast Guard Unit Commendation for its participation in the recovery of Alaska Airlines Flight 261.
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