USNS Sioux (T-ATF-171)

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USNS Sioux (T-ATF-171).jpg
USNS Sioux (T-ATF-171) entering Yokosuka Naval Base, 1984
United States
Name: USNS Sioux
Namesake: The Sioux, a Native American people
Builder: Marinette Marine Corporation, Marinette, Wisconsin
Laid down: 22 March 1979
Launched: 15 November 1980
Acquired: 1 May 1981
In service: 1981
Status: in active service
General characteristics
Class and type: Powhatan-class fleet ocean tug
  • 1,387 long tons (1,409 t) light
  • 2,000 long tons (2,032 t) full
Length: 226 ft (69 m)
Beam: 42 ft (13 m)
Draft: 15 ft (4.6 m)
Installed power: 5.73 megawatts (7,680 hp) sustained
Propulsion: 2 × General Motors EMD 20-645F7B diesel engines, two shafts with hydraulic adjustable pitch props ; Brunvoll bow thruster, 224 kW (300 hp)
Speed: 14.5 knots (26.9 km/h; 16.7 mph)
Complement: 16 civilians plus 4 U.S. Navy personnel (communications unit)

USNS Sioux (T-ATF-171) is a United States Navy Powhatan-class fleet ocean tug in service since 1981.

Sioux was laid down on 22 March 1979 by the Marinette Marine Corporation at Marinette, Wisconsin. Launched on 15 November 1980 and delivered to the U.S. Navy on 1 May 1981, Sioux was assigned to the Pacific Fleet of Military Sealift Command (MSC), and placed in non-commissioned service as USNS Sioux (T-ATF-171) in 1981. Although stationed primarily at San Diego, California, Sioux frequently operates from Pearl Harbor, Hawaii, San Francisco, California and Bremerton, Washington.

Sioux is in active service.

Service history[edit]

In 2014, Sioux came to the aid of the damaged Royal Canadian Navy vessel HMCS Protecteur which had caught fire off Hawaii. After receiving aid from USN vessels Michael Murphy and Chosin, Sioux arrived to take the vessel under tow. The tug brought the damaged ship into Pearl Harbor safely. For that mission, Sioux was awarded a Canadian Forces Unit Commendation in June 2015.[1]


  1. ^ Pugliese, David (16 June 2015). "United States Naval Ship Sioux receives Canadian Forces commendation for assisting fire-damaged HMCS Protecteur". Defence Watch. Ottawa Citizen. Retrieved 17 June 2015.

External links[edit]

Media related to USNS Sioux (T-ATF-171) at Wikimedia Commons