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NavSource Online: Mine Warfare Vessel Photo Archive


Call sign:
Nan - Able - Queen - Item

YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 18 April 1942 by Henry B. Nevins, Inc., City Island, NY
  • Launched 20 July 1942
  • Completed 6 August 1942
  • Struck from the Naval Register 19 June 1946
  • Transferred to the State Department, Foreign Liquidation Commission in December 1947
  • Fate unknown.


  • Displacement 270 t.
  • Length 136'
  • Beam 24' 6"
  • Draft 8'
  • Speed 15 kts.
  • Complement 32
  • Armament: One 3"/50 dual purpose gun mount, two 20mm mounts, and two depth charge projectors
  • Propulsion: Two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    YMS-11 152k 20 April 1942
    Cigarette case presented to Mrs. Frederic Jay Wells
    Ben Mucke
    Replacement photo added 16 August 2021
    USS YMS-11
    YMS-11 164k Dennis B. McCourt
    YMS-11 201k Guian, Samar, Philippines
    Entering Cruiser dry dock
    YMS-11 237k Guian, Samar, Philippines
    Dry docked
    YMS-11 236k
    YMS-11 197k Manus, Admiralty Islands
    Left to right: Willis Hamilton; LT John J. McCourt, Commanding Officer and Art Holland, Executive Officer
    YMS-401 220k 15 August 1945
    Manus, Admiralty Islands
    V-J Day celebration. "Beer for All Hands"

    Commanding Officers
    01LT John J. McCourt, USNRJanuary 1945 - December 1945
    Courtesy Dennis B. McCourt

    There is no DANFS history available for YMS-11
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