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NavSource Online: Mine Warfare Vessel Photo Archive

Hummer (MSC[O] 20)
ex-AMS-20
ex-YMS-372



Call sign:
November - Charlie - Zulu - Delta


Hummer served the Navies of the United States and Japan.
YMS-1 Class Auxiliary Motor Minesweeper:

  • Laid down 11 December 1942 by Weaver Shipyards, Orange, TX
  • Launched 23 December 1943
  • Completed and commissioned USS YMS-372, 28 March 1944
  • Decommissioned 23 June 1946 at San Diego, CA
    Naval Vessel Register of 1 January 1949 lists plan for decommissioning and placing in reserve as February 1947
  • Named Hummer and reclassified as a Motor Minesweeper, AMS-20, 18 February 1947
  • Recommissioned 3 November 1950
  • Decommissioned 13 November 1953 at Long Beach, CA
  • Reclassified as a Coastal Minesweeper (Old), MSC(O)-20, 7 February 1955
  • Struck from the Naval Register 12 February 1959
  • Transferred to Japan 29 January 1959 and renamed Moroshima (MSC 663)
  • Fate unknown.

    Specifications:

  • Displacement 245 t.
  • Length 136'
  • Beam 22' 9"
  • Draft 6' 3"
  • Speed 14.5 kts.
  • Complement 50
  • Armament: One 3"/50 dual purpose mount and two 20mm mounts
  • 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
    USS YMS-372
    YMS-372 121k Photo by Michael Pasterik EM1/c
    Crew member 1943 - 1945    		 John S. Pasterik
    JDS Moroshima (MSC 663)
    YMS-372 88k c. 1961
    Photo from the 1967/1968 edition of Jane's Fighting Ships    		 Mike Green
    View the Hummer (MSC[O] 20)
    DANFS history entry located on the Haze Gray & Underway website
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