continued to operate from San Diego providing high-speed target towing for ships in training along the west coast, in the Canal Zone, and, between 29 December 1938 and 25 April 1939, in the Caribbean Sea. From 3 July 1940 she was based at Pearl Harbor. She entered Pearl Harbor Navy Yard on 6 November for conversion to a high-speed minesweeper and was reclassified DMS-1 on 19 November 1940. World War II When the Japanese attacked Pearl Harbor on 7 December 1941, Dorsey was at sea with TF 3 bound for Johnston Island. The force returned to its base on 9 December, and Dorsey was assigned to the Hawaiian Sea Frontier for patrol, local escort, and training duty. Except for overhaul at San Francisco from 1 January to 11 February 1943, she remained on this duty until 24 September 1943. After scouting convoys to Efate, New Hebrides, and Noumea, New Caledonia, Dorsey sailed to the Solomon Islands for patrol and minesweeping operations. She swept and patrolled off Cape Torokina, Bougainville, and screened transports during the landings of 1 November, returning on 8 November and 13 November with reinforcement and supply convoys. She escorted from her base at Port Purvis on Florida Island to Noumea until 29 March 1944, then screened transports between Port Purvis, Kwajalein, Manus, and New Georgia until arriving at Majuro on 12 May for duty towing targets at high speed for ships in training. From 20 June to 9 July she guarded convoys between Kwajalein and Eniwetok, then escorted the escort carrier to Pearl Harbor, and proceeded to San Francisco for overhaul. Returning to Pearl Harbor on 1 October 1944, Dorsey had towing duty and joined in minesweeping experiments until 9 November when she got underway as convoy escort for Port Purvis. On 1 December, she arrived at Manus for minesweeping operations until 23 December. Continuing to San Pedro Bay, Leyte, Dorsey sortied on 2 January 1945 for the invasion of Lingayen Gulf. During the pre-invasion minesweeping she accounted for several attacking planes and rescued five survivors from stricken . Dorsey arrived off Iwo Jima for pre-invasion minesweeping on 16 February 1945. She patrolled during the assault landings, and towed to safety on 18 February. She sailed from Iwo Jima on 1 March for Ulithi to prepare for the invasion of Okinawa, where she arrived 25 March to sweep mines. On 27 March she was struck a glancing