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NavSource Online: Mine Warfare Vessel Photo Archive


Call sign:
Nan - Able - Oboe - Oboe

YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 15 May 1941 by the Krause and Banks Shipbuilding Co., Inc., North Bend, OR
  • Launched 14 March 1942
  • Completed 22 July 1942 and commissioned USS YMS-121
  • Struck from the Naval Register 3 July 1946
  • Transferred to the War Shipping Administration in March 1947
  • Registered in 1948 to Wilbur J. Smith of Rainier, OR as the towboat Dragon
  • Fate unknown.


  • Displacement 270 t.
    1948 - 252 t.
  • Length 136'
    1948 - 126.3'
  • Beam 24' 6"
    1948 - 25'
  • Draft 8'
    1948 - 11.3'
  • Speed 15 kts.
  • Complement 32
    1948 - Two
  • 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-121 148k Off the Mare Island Navy Yard, California, 21 August 1942
    Courtesy of Donald M. McPherson, 1977
    Naval History and Heritage Command photo NH 85824
    Mike Green
    YMS-121 18k c. 1943 Joe Radigan

    There is no DANFS history available for YMS-121
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    This page created and maintained by Joseph M. Radigan (of blessed memory) & Michael Mohl
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