Destroyer minesweeper
Destroyer minesweeper was a designation given by the United States Navy to a series of destroyers that were converted into high-speed ocean-going minesweepers for service during World War II. The hull classification symbol for this type of ship was "DMS." Forty-two ships were so converted, beginning with USS Dorsey (DD-117), converted to DMS-1 in late 1940, and ending with USS Earle (DD-635), converted to DMS-42 in mid-1945. The type is now obsolete, its function having been taken over by purpose-built ships, designated as "minesweeper (high-speed)" with the hull classification symbol MMD. The Clemson-class destroyers and Wickes-class destroyers chosen for conversion were obsolete four-stack destroyers built in 1918 that still had usable power plants; they were nicknamed "four-pipers" on account of their four smokestacks.