U.S. Navy
Mine Countermeasures Command . ACM-1 to ACM-16
ACM-1 USS Chimo
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1942
Commissioned
2,100
Tons
WWII
Service
Lead ship of the auxiliary minelayer class, named for the Civil War torpedo boat. Served as a floating headquarters for mine clearance operations in the Pacific. Her crew swept enemy minefields to open harbors for Allied forces.
ACM-2 USS Planter
Auxiliary Minelayer
PACIFIC
Civil War Vessel Name
MINE COUNTERMEASURES
1942
Commissioned
2,100
Tons
WWII
Service
Named for the Confederate steamer famously commandeered by Robert Smalls in 1862. Served as a mine countermeasures command ship, coordinating sweeping operations to clear enemy-laid minefields across the Pacific theater.
ACM-3 USS Barricade
Auxiliary Minelayer
PACIFIC
Defensive Name
MINE COUNTERMEASURES
1942
Commissioned
2,100
Tons
WWII
Service
Carried a name befitting her mission — creating defensive barriers of mines against enemy naval forces. Served as a mine countermeasures command vessel, directing sweeping and laying operations across the Pacific.
ACM-4 USS Buttress
Auxiliary Minelayer
PACIFIC
Defensive Name
MINE COUNTERMEASURES
1942
Commissioned
2,100
Tons
WWII
Service
Named for a structural support — fitting for a ship whose mission was to reinforce defensive minefields. Served as a floating headquarters for mine countermeasures operations in forward combat areas.
ACM-6 USS Bastion
Auxiliary Minelayer
PACIFIC
Defensive Name
MINE COUNTERMEASURES
1942
Commissioned
2,100
Tons
WWII
Service
Named for a fortified position — her role was to create and maintain defensive mine barriers. Coordinated mine countermeasures operations as a command vessel in the Pacific theater.
ACM-7 USS Obstructor
Auxiliary Minelayer
PACIFIC
Defensive Name
MINE COUNTERMEASURES
1943
Commissioned
2,100
Tons
WWII
Service
Her name said it all — built to obstruct enemy naval movement through defensive minefields. Served as a command ship for mine clearance operations, directing minesweepers in forward areas.
ACM-8 USS Picket
Auxiliary Minelayer
PACIFIC
Defensive Name
MINE COUNTERMEASURES
1943
Commissioned
2,100
Tons
WWII
Service
Named for the forward defensive line — the picket. Served as a mine countermeasures command vessel, directing sweeping operations to clear enemy minefields ahead of advancing Allied forces.
ACM-9 USS Trapper
Auxiliary Minelayer
PACIFIC
Defensive Name
MINE COUNTERMEASURES
1943
Commissioned
2,100
Tons
WWII
Service
Named to evoke the mine's role as an underwater trap. Served as a floating headquarters for mine countermeasures, coordinating sweeper groups tasked with clearing harbors and sea lanes of enemy mines.
ACM-10 USS Monadnock
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1944
Commissioned
2,100
Tons
WWII
Service
Named for the Civil War monitor and Mount Monadnock. Reclassified from minelayer to mine countermeasures command ship, directing sweeping operations to clear Japanese minefields in the western Pacific.
ACM-11 USS Camanche
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1944
Commissioned
2,100
Tons
WWII
Service
Named for the Civil War monitor USS Camanche, the first warship assembled on the Pacific Coast. Served as a mine countermeasures command vessel, coordinating minesweeping operations in the Pacific theater.
ACM-12 USS Canonicus
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1944
Commissioned
2,100
Tons
WWII
Service
Named for the lead ship of the Canonicus-class monitors of the Civil War. Served as a mine countermeasures command ship, directing operations to neutralize enemy mine threats in the western Pacific.
ACM-13 USS Miantonomah
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1944
Commissioned
2,100
Tons
WWII
Service
Named for the Narragansett chief and the Civil War monitor that bore his name. Reclassified for mine countermeasures command, she directed minesweeping groups clearing Japanese-laid mines across the Pacific.
ACM-14 USS Monadnock
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1944
Commissioned
2,100
Tons
WWII–Korea
Service
Second ship in the ACM series to carry the Monadnock name. Reclassified for mine countermeasures command duties, she served through the end of World War II and into the Korean War era as a mine warfare command platform.
ACM-15 USS Nausett
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1944
Commissioned
2,100
Tons
WWII
Service
Named for the Civil War monitor USS Nausett. Served as a mine countermeasures command ship in the Pacific, coordinating minesweeper groups during the island-hopping campaign and postwar mine clearance operations.
ACM-16 USS Puritan
Auxiliary Minelayer
PACIFIC
Civil War Monitor Name
MINE COUNTERMEASURES
1945
Commissioned
2,100
Tons
WWII–Korea
Service
Named for the Civil War monitor USS Puritan. One of the last ACM ships commissioned, she served through the end of World War II and continued mine countermeasures command duties into the Korean War era.
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