A submarine chaser or subchaser is a small naval vessel that is specifically intended for anti-submarine warfare. Many of the American submarine chasers used in World War I found their way to Allied nations by way of Lend-Lease in World War II. Submarine chaser variants U.S. Navy submarine chasers were designed specifically to destroy German submarines in World War I, and Japanese and German submarines in World War II. The small SC-1-class submarine chasers of the design used in World War I carried the hull designator SC (for Submarine Chaser). Their main weapon was the depth charge. They also carried machine guns and anti-aircraft guns. The similar-sized SC-497-class was built for World War II. Also in World War II, larger PC-461-class submarine chasers used the PC hull classification symbol (for Patrol, Coastal). Class relationships: 438 (98t, wooden hull) 343 (450t, steel hull) 68 (850t, steel hull) used in similar role as the submarine chasers 123 design basis for the PCE-842 class equipped with substantial anti-submarine capabilities and used as escorts 95 (890t, steel hull) predecessor design to the Admirable class 481 (270t, wooden hull) In early 1915, the British Admiralty selected the US Electric Launch Company (Elco) for the production of 50 Motor Launches for anti-submarine work, British industry being at maximum capacity. This order was eventually increased by a further 530. The whole order was completed by November 1916, and the vessels entered Royal Navy service. The vessels were in length and capable of . They were armed with a 3-pounder gun, towed paravanes to attack submarines and, later, depth charges. Additional Motor Launches of the Fairmile A, Fairmile B and other classes were built for World War II. War service The British sub chasers were operated around the coast in defence. However, they were uncomfortable, wet and not suited to British sea conditions. Although used during the First World War, they were sold when the war ended. Submarine chasers were used mostly by the United States Coast Guard in World War II for destroying German U-boats that were stationed off the coast of the United States that were trying to sink merchant convoys as they departed American ports. In the Pacific Theatre, submarine chasers were used for amphibious landings, courier and escort duty. Eight British Fairmile B Motor Launches were transferred from Canada to the US in World War II, and included the SC-1466 class of sub-chasers. The