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.

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.

Reclassified MSC(O)-20, 7 February 1955, the ship was transferred to the Japanese Maritime Self Defense Force 29 January 1959, serving as Moroshima.