Bolster-class rescue and salvage ship

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USS Conserver (ARS-39) off Oahu, Hawaii, 26 April 1967
Class overview
Builders	Basalt Rock Company
Operators	United States Navy  Republic of China Navy
Preceded by	Diver class
Succeeded by	Safeguard class
Built	1944–1946
In commission	1944–present
Planned	12
Completed	6
Cancelled	6
Active	1
Retired	5
General characteristics
Type	Rescue and salvage ship
Displacement	1,497 long tons (1,521 t) (lt) 2,048 long tons (2,081 t) (fl)
Length	213 ft 6 in (65.07 m)
Beam	39 ft (12 m)
Propulsion	diesel-electric, twin screws, 2,780 hp (2,070 kW)
Speed	15 knots (28 km/h; 17 mph)
Complement	100
Armament	2 × 40 mm guns

The Bolster class were a series of rescue and salvage ships designed and built for the United States Navy during World War II. Rescue and salvage ships such as the Bolster class save battle-damaged combat ships from further damage and tow them to safety. Rescue, salvage and towing ships provide rapid fire fighting, pumping, battle damage repair and rescue towing to warships in combat and tow them to repair ships or bases in safe areas.