USS Caiman (SS-323), a Balao-class submarine, was a ship of the United States Navy that was later transferred to the Turkish Naval Forces in 1972 under the Security Assistance Program, where she was recommissioned as the third TCG Dumlupınar. She was retired in 1986. Career (US) Originally Blanquillo, the vessel was renamed on 24 September 1942 after the caiman, a fresh water alligator inhabiting the Amazon River, and launched on 30 March 1944 by Electric Boat Co., Groton, Connecticut; sponsored by Mrs. R. C. Bonjour; commissioned 17 July 1944. She reported to the Pacific Fleet. During World War II, Caiman sailed from Pearl Harbor on her first war patrol 13 November 1944. Pausing at Saipan to put ashore her severely ill commanding officer and embark his relief, the submarine pushed on to the South China Sea, where she combined offensive patrol with lifeguard duty as a part of air-sea rescue operations to save aviators downed in air strikes on enemy-held territory. Aggressive American submarine and naval air attack had already greatly reduced the Japanese merchant fleet; hence Caiman made no contacts on this patrol, from which she returned to Fremantle, Australia, on 22 January 1945 to refit. Her second patrol, performed in the South China Sea and off the Gulf of Siam, from 18 February to 6 April, also yielded no contacts, but on her third, which began at Subic Bay in the Philippines on 28 April, she sank two small schooners. Their use illustrated graphically the almost complete loss of modern merchant ships which the Japanese had suffered largely at the hands of the U.S. Navy. Returning to Fremantle 27 June from her patrol area off southern Indo-China and western Borneo, the submarine refitted for her fourth war patrol, during which she performed three dangerous special missions, landing and later evacuating agents from the coast of Java. On this patrol, which took place from 22 July to the end of hostilities, she sank another Japanese schooner. She returned to Subic Bay 19 August, then sailed for the West Coast. Post-World War II, Caiman operated out of San Diego, Guam, and Pearl Harbor in 1946. In 1947 she made an Arctic familiarization cruise out of Seattle as part of Operation Blue Nose. Thereafter, based on Seattle, she served as reserve training ship until 23 April 1951, when she began a GUPPY conversion at Mare Island Naval Shipyard. Since then based