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NavSource Online: Mine Warfare Vessel Photo Archive


AMS-171 was built for Belgium and transferred to Greece

Niovi (M 254) call sign:
Sierra - Zulu - Alpha - Zulu

Adjutant Class Motor Minesweeper:

  • Laid down 27 March 1953 as AMS-171 by the Consolidated Shipbuilding Corp., Morris Heights, NY
  • Launched 1 July 1954
  • Completed 11 August 1954, transferred to Belgium and named Laroche (M 924)
  • Reclassified by U. S. Navy as a Coastal Minesweeper, MSC-171, 7 February 1955
  • Returned to U. S. Navy custody
  • Transferred to Greece in 1969 and renamed RHNS Niovi (M 254)
  • Fate unknown.


  • Displacement 405 t.
  • Length 144'
  • Beam 27'
  • Draft 9'
  • Speed 14 kts.
  • Complement 40
  • Armament: Two twin 20mm mounts
  • Propulsion: Two General Motors diesel engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    AMS-171 67k Launching ceremony
    Photo courtesy of the City Island Nautical Museum
    Tom Nye
    AMS-171 68k After launching
    Courtesy of the City Island Nautical Museum
    RHNS Niovi (M 254)
    AMS-171 113k c. 1971
    Photo courtesy Michael D. J. Lennon
    Robert Hurst

    There is no DANFS history available for MSC-171
    Additional Resources and Websites of Interest
    Naval Minewarfare Association Association of Minemen

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    This page created and maintained by Joseph M. Radigan
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