 The auxiliary motor minesweepers were originally designated yard minesweepers (YMS) and kept the abbreviation YMS after being re-designated.The type proved successful and eventually became the basis for the AMS type of United States Navy minesweeper.The Henry B. Nevins Shipyard, Inc., at City Island, Bronx, designed the YMS and laid the keel of the first one, , on 4 March 1941.