The USS Diploma (AM-221) was an Admirable-class minesweeper constructed for the United States Navy during World War II. Launched on 21 May 1944 by Tampa Shipbuilding Co. in Tampa, Florida, she was commissioned on 15 July 1944. The vessel featured the typical design of Admirable-class minesweepers, which were designed for clearing mines in naval operations and supporting amphibious assaults. During her service in World War II, USS Diploma played a significant role in the Pacific Theater. She arrived at Pearl Harbor on 12 January 1945 towing the disabled U.S. Army freighter FS-318. Soon after, she conducted convoy escort missions to Guam and Eniwetok, returning to Pearl Harbor in mid-February. From there, she participated in minesweeping operations at Ulithi in preparation for the invasion of Okinawa. From 24 March to 1 April 1945, she engaged in pre-invasion minesweeping and patrol duties during the initial landings at Okinawa. After repairs at Ulithi from 17 April to 15 May, she continued convoy escort and patrol missions around Guam, Saipan, and Okinawa. Notably, from 4 to 31 July 1945, she supported final U.S. Fleet raids on the Japanese mainland by sweeping mines in the East China Sea, Ryukyus, and Tsugaru Straits. Her service earned her three battle stars, reflecting her active participation in key operations. Following the war, USS Diploma remained operational in the Pacific, conducting minesweeping activities until she returned to the United States, arriving at San Diego in December 1945. She was decommissioned on 3 September 1946 and placed in reserve. She was reclassified as MSF-221 in 1955 but was never reactivated for service. In 1962, the vessel was transferred to the Mexican Navy, where she was renamed ARM DM-17 and later ARM Cadete Francisco Márquez (C59) in 1994. She remained in service until being stricken in 2000. Subsequently, she was cleaned of contaminants and sunk as an artificial reef off Isla Espiritu Santo near La Paz, Baja California Sur, Mexico, in 2004. Resting on her side at a depth of approximately 70 feet (20 meters) to 30 feet (9 meters), she has become a popular dive site known as The C59, serving as a maritime relic and habitat for marine life.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.