USS Firm (AM-98) was an Adroit-class minesweeper of the United States Navy. Laid down on 21 October 1941 by the Penn-Jersey Corp., Camden, New Jersey, launched on 29 May 1942, and commissioned on 10 April 1943. The vessel was reclassified as a submarine chaser PC-1602 on 1 June 1944; it was later reclassified as a control submarine chaser PCC-1602 on 1 August 1945. Very little information is available about the activities of this vessel while operating as a submarine chaser. PC-1602 was transferred to the Maritime Commission for disposal on 15 June 1948, and sold to Walter H. Wilms. Fate unknown.
USS Direct (AM-90) was an Adroit-class minesweeper of the United States Navy. It was laid down on 26 December 1941 by the Dravo Corporation, Neville Island, Pittsburgh, Pennsylvania, launched on 25 April 1942, and commissioned on 31 August 1942. The ship started conversion to a submarine chaser on 16 May 1944 at Norfolk, Virginia, and was reclassified PC-1594 on 1 June 1944.
USS PC-1603 was a submarine chaser of the United States Navy during World War II. She was originally built and commissioned as USS Force (AM-99), an Adroit-class minesweeper. On 1 June, she was renamed PC-1603 and earned three battle stars for service in the Pacific during the war. The ship was damaged by a pair of kamikaze aircraft on 26 May 1945 and later scuttled.
USS PGM-17 was a PGM-9-class motor gunboat built for the United States Navy during World War II. She was laid down and launched as USS PC-1189, a PC-461-class submarine chaser, but was renamed and reclassified before her November 1944 commissioning. She ran aground near Okinawa in May 1945. She was salvaged a month later, but was never repaired. She was towed to deep water and sunk in October 1945.
USS PGM-1 was a PGM-1 class motor gunboat that served in the United States Navy during World War II.
USS PGM-2 was a PGM-1 class motor gunboat that served in the United States Navy during World War II. She was originally laid down as an SC-497 class submarine chaser on 16 July 1942 by the Robinson Marine in Benton Harbor, Michigan and launched on 17 June 1943. She was commissioned as USS SC-757 on 12 August 1943. She was later converted to a PGM-1 class motor gunboat and renamed PGM-2 on 10 December 1943. After the war she was sold and transferred to the Foreign Liquidations Commission at Subic Bay, Philippines on 20 May 1947. Her exact fate is unknown.
USS PGM-4 was a PGM-1 class motor gunboat that served in the United States Navy during World War II. She was originally laid down as an SC-497 class submarine chaser on 11 April 1942 by the Wilmington Boat Works, Inc. in Wilmington, California and launched on 7 September 1942. She was commissioned as USS SC-1053 on 17 March 1943. She was later converted to a PGM-1 class motor gunboat and renamed PGM-4 on 10 December 1943. After the war she was transferred to the Foreign Liquidations Commission on 9 June 1947. Her exact fate is unknown.
USS PGM-5 was a PGM-1 class motor gunboat that served in the United States Navy during World War II. She was originally laid down as an SC-497 class submarine chaser on 14 May 1942 by the Wilmington Boat Works in Wilmington, California and launched on 2 November 1942. She was commissioned as USS SC-1056 on 15 June 1943. She was later converted to a PGM-1 class motor gunboat and renamed PGM-5 on 10 December 1943. After the war she was transferred to the Foreign Liquidations Commission on 7 May 1947. Her exact fate is unknown.
USS PGM-6 was a PGM-1 class motor gunboat that served in the United States Navy during World War II. She was originally laid down as a SC-497 class submarine chaser on 6 February 1943 by the Mathis Yacht Building Company in Camden, New Jersey and launched on 20 May 1943. She was commissioned as USS SC-1071 on 8 June 1943. She was later converted to a PGM-1 class motor gunboat and renamed PGM-6 on 10 December 1943. During the war she took part in the Pacific Theater. After the war she was transferred to the Foreign Liquidations Commission on 7 May 1947. Her exact fate is unknown.
USS SC-636 was a SC-497 class submarine chaser that served in the United States Navy during World War II.
The SC-497-class submarine chasers were a class of 438 submarine chasers built primarily for the United States Navy from 1941–1944. The SC-497s were based on the experimental submarine chaser, USS SC-453. Submarine chasers of this variety were collectively nicknamed "the splinter fleet" due to their wooden hulls.
USS SC-497 was a SC-497 class submarine chaser that served in the United States Navy and later the Free French Navy during World War II. She was originally laid down as PC-497 on 29 November 1941 by the Westergard Boat Works in Rockport, Texas, and launched on 4 July 1941. She was commissioned as USS PC-497 on 16 October 1942. She was later reclassified as a SC-497 class submarine chaser and renamed SC-497. She was transferred to the Free French Navy as part of the Lend-Lease program on 18 March 1944 as CH-96. The transfer was made permanent on 15 August 1944. She was renamed CH-724 in 1952 and later P-724 before being withdrawn from service on 23 October 1980. Her exact fate is unknown.
USS SC-499 was a SC-497 class submarine chaser that served in the United States Navy and later the United States Coast Guard during World War II. She was laid down as SC-499 on 24 February 1941 by the Fisher Boat Works in Detroit, Michigan, and launched on 24 October 1941. She was commissioned as USS SC-499 on 18 March 1942. She was later transferred to the Coast Guard on 20 August 1945. Her exact fate is unknown.
USS SC-501 was a SC-497 class submarine chaser that served in the United States Coast Guard and later the United States Navy during World War II. She was originally laid down as PC-501 on 29 April 1941 by the Seabrook Yacht Corporation in Houston, Texas, and launched on 24 January 1942. She was reclassified SC-501 on 8 April 1943, and acquired from the Coast Guard on 9 April 1943. She was reclassified as Unclassified Miscellaneous Vessel IX-100 on 21 April 1943 and named Racer on 3 May 1943. She was in service from 27 May 1943 to 21 May 1946. She was struck from the Navy Register on 5 June 1946 and sold to the private market on 20 December 1946.
The PC-461-class submarine chasers were a class of 343 submarine chasers constructed mainly for the US Navy and built from 1941 to 1944. The PC-461s were based primarily on two experimental submarine chasers, PC-451 and PC-452. While PC-461 began the series, the first of the class to enter service was PC-471. As part of the Lend-Lease program, 46 ships of this class were transferred to allies of the United States. Fifty-nine PC-461s were converted to other types of patrol vessels. Eight vessels of this class were lost, and one vessel was lost after conversion to a PGM-9-class motor gunboat. Only one of the class, USS PC-566 commanded by Lieutenant Commander Herbert G. Claudius, actually sank a submarine, U-166, during World War II; however, the website 'Patrol Craft Sailors Association' cites PC-461-class ships sinking or assisting sinking up to 6 German and Japanese subs.
The SC-1 class was a large class of submarine chasers built during World War I for the United States Navy. They were ordered in very large numbers in order to combat attacks by German U-boats, with 442 boats built from 1917 to 1919.
USS SC-696 was an SC-497-Class Submarine chaser of the United States Navy during World War II. She was sunk on 23 August 1943 by German dive bombers.
USS SC-744 was an SC-497-Class submarine chaser of the United States Navy during World War II. She was sunk by a Japanese Kamikaze in 1944.
Wilmington Boat Works, Inc. or WILBO was a shipbuilding company in Wilmington, California. To support the World War 2 demand for ships Victory Shipbuilding built: Tugboats, crash rescue boats and sub chasers. Wilmington Boat Works opened in 1920 building Fishing boat and yachts, by Hugh Angelman, Willard Buchanan and Tom Smith. After the Korean War the shipyard closed in 1958. The shipyard was located at 400 Yacht Street, Wilmington, the site of the current USC boatyard.
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United States Navy 
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