May, she returned to San Diego. On 1 July 1960, she was redesignated an auxiliary submarine with hull classification symbol AGSS-400; and, from that time through 1963, she was primarily engaged in training operations off the West Coast. Only two deployments to the western Pacific during February–August 1961 and June–December 1963 interrupted that schedule. Decommissioning and disposal In 1964 Sea Devil commenced inactivation for the last time. On 17 February 1964, she was decommissioned. Her name was struck from the Naval Vessel Register on 1 April 1964, and she was sunk as a target off Southern California on 24 November 1964. Awards Sea Devil earned five battle stars for her World War II service. 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. . Balao-class submarines World War II submarines of the United States Cold War submarines of the United States Korean War submarines of the United States Ships built in Kittery, Maine 1944 ships Friendly fire incidents of World War II Maritime incidents in April 1945 Maritime incidents in 1964 Ships sunk as targets Shipwrecks of the California coast