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NavSource Online: Mine Warfare Vessel Photo Archive

MSO / AG-521 Assurance


Contributed by Mike Smolinski


Ability Class Minesweeper: Authorized as AM-521; Reclassified MSO-521, 7 February 1955; Laid down, 28 January 1957 at Peterson Builders, Inc., Sturgeon Bay, WI; Launched, 31 August 1957; Commissioned USS Assurance (MSO-521), 21 November 1958 at Boston Naval Shipyard, Boston, MA; Reclassified Miscellaneous Auxiliary AG-521 sonar research ship, 1 March 1973; Decommissioned, 30 September 1977; Struck from the Naval Register, 30 September 1977; Sold for scrapping, 1 July 1978 by Defense Reutilization and Marketing Service to Ampel Wrecking and Dismantling Corp.

Specifications: Displacement 633 t.(lt) , 750 t.(fl); Length 173'; Beam 36'; Draft 14'; Speed 14 kts; Complement eight Officers, 70 Enlisted; Armament one 40mm gun mount, two .50 cal. machine guns; Propulsion four General Motors diesel engines, two shafts, two controllable pitch propellers.
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Size Image Description Source
Assurance 61k Photo courtesy Peterson Builders USS Assurance web site
Dick Lewis
Assurance 60k c. 1973 Seen here as
AG-521 Sonar Research Ship
USS Assurance web site
Dick Lewis

View the Assurance (MSO-521)
DANFS History entry located on the Haze Gray & Underway Web Site. The main archive for the DANFS Online Project.

Crew Contact And Reunion Information
U.S.Navy Memorial Foundation
Fleet Reserve Association

Additional Resources and Web Sites of Interest
A Salute to USS Assurance (MSO-521)
102 Minesweepers (MSO) Oceangoing Minesweepers
Naval Minewarfare Association
Association of Minemen
Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back To The Mine Sweeper (AM) Photo Index

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