 Surviving YMSs were reclassified as AMS in 1947, given names, and re-rated as mine warfare ships; in 1955 they received the new type symbol MSC(O), changed to MSCO in 1967.These ships bore much of the mine warfare burden in Korea, formed a major portion of U.S. Navy minecraft strength through the 1950s, and provided underway training for Naval Reservists in the 1960s.A number of YMSs were transferred to other navies during or after the war.