|Builder||Defoe Shipbuilding Co., Bay City, Michigan|
|Fate||Contract cancelled, 12 August 1945|
|General characteristics (as designed)|
|Displacement||625 long tons (635 t)|
|Length||184 ft 6 in (56.24 m)|
|Beam||33 ft (10 m)|
|Draft||10 ft (3.0 m)|
|Speed||15 knots (28 km/h; 17 mph)|
|Complement||104 officers and men|
USS Sentinel (AM-412) was a steel-hulled fleet (oceangoing) minesweeper of the Admirableclass planned for the United States Navy. She was a part of a group of minesweepers scheduled to be built as replacements and for Lend-Lease commitments. On 12 August 1945, three days before hostilities ceased in the Pacific, the U.S. Navy cancelled its contract with the Defoe Shipbuilding Co., Bay City, Michigan, for the construction of Sentinel.
A minesweeper is a small warship designed to remove or detonate naval mines. Using various mechanisms intended to counter the threat posed by naval mines, minesweepers keep waterways clear for safe shipping.
The Admirable class was one of the largest and most successful classes of minesweepers ordered by the United States Navy during World War II. Typically, minesweepers detected and removed naval mines before the rest of the fleet arrived, thereby ensuring safe passage for the larger ships. They were also charged with anti-submarine warfare (ASW) duties with rear-mounted depth charge racks and a forward-firing Hedgehog antisubmarine mortar. Their job was essential to the safety and success of U.S. naval operations during World War II and the Korean War. These minesweepers were also employed as patrol vessel and convoy escorts.
The Bangor-class minesweepers were a class of warships operated by the Royal Navy (RN), Royal Canadian Navy (RCN), Imperial Japanese Navy (IJN), and Royal Indian Navy (RIN) during the Second World War.
The Ton class were coastal minesweepers built in the 1950s for the Royal Navy, but also used by other navies such as the South African Navy and the Royal Australian Navy. They were intended to meet the threat of seabed mines laid in shallow coastal waters, rivers, ports and harbours, a task for which the existing ocean-going minesweepers of the Algerine-class were not suited.
The Auk class were Allied minesweepers serving with the United States Navy and the British Royal Navy during the Second World War. In total, there were 95 Auks built.
The Lapwing-class minesweeper, often called the Bird class, was an early "AM-type" oceangoing minesweeper of the United States Navy. Seven ships of the class were commissioned during World War I, and served well into the 1950s. A number were refitted to serve as ocean-going tugs, salvage vessels, seaplane tenders, or submarine rescue ships.
USS Sentinel may refer to the following ships of the United States Navy:
USS Sentinel (AM-113) was an Auk-class minesweeper built for the United States Navy during World War II; she was the third U.S. Naval vessel to bear the name. It was laid down on 28 November 1941 by the American Ship Building Company, Cleveland, Ohio; launched on 23 May 1942; and commissioned on 3 November 1942, Lt. Comdr. George Lincoln Phillips, USNR, in command.
USS Sentinel (AMCU-39) was a LCI(L)-351-class large landing craft of the United States Navy, later converted to an AMCU-7-class coastal minesweeper.
Auxiliary motor minesweepers were small wood-hulled minesweepers commissioned by the United States Navy for service during World War II. The vessels were numbered, but unnamed. 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.
Naval trawlers are vessels built along the lines of a fishing trawler but fitted out for naval purposes; they were widely used during the First and Second World Wars. Some—known in the Royal Navy as "Admiralty trawlers"— were purpose-built to naval specifications, others adapted from civilian use. Fishing trawlers were particularly suited for many naval requirements because they were robust vessels designed to work heavy trawls in all types of weather, and had large clear working decks. A minesweeper could be created by replacing the trawl with a mine sweep. Adding depth charge racks on the deck, ASDIC below, and a 3-inch (76 mm) or 4-inch (102 mm) gun in the bow equipped the trawler for anti-submarine duties.
The R boats were a group of small naval vessels built as minesweepers for the Kriegsmarine before and during the Second World War. They were used for several purposes during the war, and were also used post-war by the German Mine Sweeping Administration for clearing naval mines.
The M class were the standard minesweeper of Nazi Germany's Kriegsmarine during World War II. The vessels were the primary force in Germany's harbor defense command and were organized administratively into minesweeper flotillas.
The Yevgenya class are a series of minesweepers built for the Soviet Navy and export customers between 1967 and 1980. The Soviet designation was Project 1258 Korund.
HMAS Goorangai was a 223-ton auxiliary minesweeper of the Royal Australian Navy (RAN). She was built in 1919 for the Government of New South Wales, then sold in 1926 to the fishing company Cam & Sons. The trawler was requisitioned for military service following the outbreak of World War II, converted into a minesweeper, and assigned to Melbourne. She was sunk in an accidental collision with MV Duntroon in 1940, becoming the RAN's first loss of World War II, and the first RAN surface ship to be lost in wartime.
The Craft of Opportunity Program (COOP) was a Royal Australian Navy (RAN) acquisition program intended to supplement the navy's mine warfare capability with civilian vessels that could be quickly converted into minesweepers. Vessels acquired under COOP were not commissioned into the RAN, and instead operated with the prefix "MSA".
HMCS Quinte was a Bangor-class minesweeper constructed for the Royal Canadian Navy during the Second World War. The ship entered service in 1941 and took part in the Battle of the Atlantic. On 30 November 1942, Quinte ran aground and sank off Cape Breton Island. The ship was re-floated and repaired and spent the rest of the war as a training ship. Following the war, the minesweeper was used for naval research until decommissioned in 1946. The vessel was sold for scrap and broken up in 1947.
HMCS Mulgrave was a Bangor-class minesweeper that served with the Royal Canadian Navy during the Second World War. Entering service in 1942, the minesweeper took part in the Battle of the Atlantic and the invasion of Normandy. While sweeping for naval mines off France in 1944, the vessel hit one. The ship was towed back to port where Mulgrave was declared a constructive total loss. Laid up until the end of the war, the minesweeper was broken up in 1947.
The MT class were a group of coastal minesweepers built for the Soviet Navy in the 1943-1945. The Soviet designation was Project 253L.