After completion of her refit, Trepang departed Pearl Harbor and arrived at San Diego on 3 September 1945. Decommissioned on 27 June 1946 and placed in reserve at Vallejo, California, at the Mare Island Naval Shipyard, Trepang remained in reserve until 1967. She was redesignated as an auxiliary submarine and given the hull classification symbol AGSS-412 on 11 June 1962. Disposal Struck from the Naval Vessel Register on 30 June 1967 Trepang was authorized for disposal on 22 December 1967. She was sunk as a target in the Pacific Ocean off Southern California during Exercise "Strike Ex 4-69" on 16 September 1969 by the combined gunfire of the destroyers and . Honors and awards Trepang received five battle stars for World War II service and a Navy Unit Commendation. In media While in reserve, Trepang appeared in "Dennis at Boot Camp," the ninth episode of the fourth season of the American situation comedy Dennis the Menace, first broadcast in the United States on 25 November 1962. References Citations Bibliography Hinman, Charles R., and Douglas E. Campbell. The Submarine Has No Friends: Friendly Fire Incidents Involving U.S. Submarines During World War II. Syneca Research Group, Inc., 2019. . External links NavSource Photo Library fleetsubmarine.com: USS Trepang Episode "Dennis at Boot Camp" of Dennis the Menace on YouTube, including footage of USS Trepang Balao-class submarines World War II submarines of the United States Ships built in Vallejo, California 1944 ships Friendly fire incidents of World War II Maritime incidents in June 1945 Maritime incidents in 1969 Ships sunk as targets Shipwrecks of the California coast Shipwrecks in the Pacific Ocean