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.
A port bow view of the fleet tug USNS SIOUX (T-ATF 171) moored at a pier - DPLA - f7a79cf36b1f9b4a01054425b20ff8d9
USNS Sioux (T-ATF 171) entering Yokosuka port
USNS Sioux (T-ATF-171)
USNS Sioux and USNS Mercy in the Philippines
US Navy 040716-N-6811L-143 Master Chief Boatswain's Mate Hugh Scully, a Navy Diver assigned to Mobile Diving Salvage Unit One (MDSU-1), gives a pre-diving operations safety brief, aboard USNS Sioux (T-ATF 171)
US Navy 040716-N-6811L-182 Boatswain's Mate 2nd Class Jack McPherson performs a leak check on the MK-21 Underwater Breathing Apparatus worn by Hull Maintenance Technician 2nd Class Jody Kappen aboard USNS Sioux (T-ATF 171)
US Navy 040716-N-6811L-291 Hull Maintenance Technician 2nd Class Justin Culver, a Navy Diver assigned to Mobile Diving Salvage Unit One (MDSU-1), exits the Transportable Recompression Chamber System
US Navy 040716-N-6811L-209 Navy Diver, Hull Maintenance Technician 1st Class Rick Pelton, assigned to Mobile Diving Salvage Unit One (MDSU-1), signals the winch operator aboard USNS Sioux (T-ATF 171)
US Navy 100514-N-0000B-001 Members of Deep Submergence Unit deploy a submarine rescue chamber
US Navy 101026-N-8824M-092 Navy Diver 2nd Class Dylan Oursler removes the vision dome from the Atmospheric Diving Suit 2000 of Navy Diver 2nd Class
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