USS Hummer (AMS-20)

For other ships of the same name, see USS Hummer.
Career (United States)
Ordered: as USS YMS-372
Laid down: 11 December 1942
Launched: 23 December 1943
Commissioned: 28 March 1944
Decommissioned: 23 June 1946
In service: 3 November 1950
Out of service: 13 November 1953
Struck: 12 February 1959
Fate: transferred to Japan, 29 January 1959
Career (Japan)
Name: JDS Moroshima (MSC-663)
Acquired: 29 January 1959
General characteristics
Displacement: 215 tons
Length: 136 ft (41 m)
Beam: 24 ft 6 in (7.47 m)
Draught: 10 ft (3.0 m)
Speed: 13 knots
Complement: 50
Armament: one 3” gun mount

USS Hummer (AMS-20/YMS-372) was a YMS-1-class minesweeper of the YMS-135 subclass acquired by the U.S. Navy for the task of removing mines that had been placed in the water to prevent ships from passing.


Hummer (YMS-372) was launched as YMS-372, 23 December 1943 by Weaver Shipyards, Orange, Texas; and commissioned 28 March 1944. She was named Hummer and reclassified AMS-20 on 17 February 1947.

After shakedown and operational training in early 1945, Hummer departed the United States to sweep mines and to patrol between Okinawa and Japan from 29 June to 31 July.

With the cessation of hostilities, the ship swept mines on the coasts of Japan and Korea until 21 February 1946 when she departed for the Western Seaboard of the United States.

Hummer decommissioned 23 June and joined the Pacific Reserve Fleet. She recommissioned 3 November 1950 to help support the United Nations commitment to containing aggression in Korea. Her training and readiness activities centered on the U.S. West Coast between San Diego, California, and San Francisco, California, until 13 November 1953 when she again decommissioned at Long Beach, California. Reclassified MSC(O)-20, 7 February 1955, the ship was transferred to the Japanese Maritime Self Defense Force 29 January 1959, serving as Moroshima.

Military awards and honors

Hummer received three battle stars for her service World War II.


  • This article incorporates text from the here.

External links

  • Photo gallery of Hummer at NavSource Naval History

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