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NavSource Online: Mine Warfare Vessel Photo Archive
Contributed by Mike Smolinski

Assurance (AG 521)
ex-MSO-521



Call sign:
November - Romeo - Alpha - Echo
Ability Class Minesweeper:

  • Laid down 28 January 1957 by Peterson Builders, Inc., Sturgeon Bay, WI
  • Launched, 31 August 1957
  • Commissioned USS Assurance (MSO-521), 21 November 1958 at Boston Naval Shipyard, Charlestown, MA
  • Reclassified as a Miscellaneous Auxiliary, AG-521, 1 March 1973
  • Decommissioned, 30 September 1977 and struck from the Navy Register
  • Sold for scrap 1 July 1978 by the Defense Reutilization and Marketing Service to Ampel Wrecking and Dismantling Corp.

    Specifications:

  • Displacement 934 t.
  • Length 190'
  • Beam 36'
  • Draft 12'
  • Speed 15 kts.
  • Complement 83
  • Armament: One 40mm gun mount and two .50 cal. machine guns
  • Propulsion: Two 1,400hp General Motors 8V498 diesel engines, two shafts, two controllable pitch propellers.
    Click on thumbnail
    for full size image    		 Size Image Description Source
    USS Assurance (MSO 521)
    Assurance 61k Photo courtesy Peterson Builders USS Assurance web site
    Dick Lewis
    USS Assurance (AG 521)
    Assurance 112k U.S. Navy photo Tom Langford
    Assurance 60k c. 1973
    Seen here as AG-521 a 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.
    Additional Resources and Web Sites of Interest
    A Salute to USS Assurance (MSO-521)
    102 Minesweepers (MSO) Oceangoing Minesweepers
    Association of Minemen
    Navy MSO Association
    Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back to the Ocean Minesweeper (MSO) Photo Index Back to the Auxiliary Ship Index Back to the Miscellaneous Auxiliary (AG) Photo Index
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    This page created by Gary P. Priolo and maintained by Joe Radigan
    © 2006 Gary P. Priolo © 1996 - 2006 NavSource Naval History. All Rights Reserved.