(AM-221: dp. 530; l. 184'6"; b. 33'; dr. 9'9"; s. 15 k.; cpl. 104; a. 1 3"; el. Admirable)
A certificate conferring some privilege, honor, or power.
Diploma (AM-221) was launched 21 May 1944 by Tampa Shipbuilding Co., Inc., Tampa, Fla.; sponsored by Mrs. F. J. Erwin, Jr.; and commissioned 15 July 1944, Lieutenant A. B. Baxter, USNR, in command.
Diploma arrived at Pearl Harbor 12 January 1945 with the disabled Army freighter FS-318 in tow. The next day she sailed on convoy escort duty to Guam and Eniwetok, returning to Pearl Harbor 17 February. Diploma was underway from Pearl Harbor 23 February for Ulithi where she conducted minesweeping exercises in preparation for the invasion of Okinawa. On 19 March she got underway for Okinawa to engage in preinvasion minesweeping from 24 March until 1 April and then patrolled during the initial landings. From 17 April to 15 May she was in Ulithi for repairs.
After escorting convoys to Guam and Saipan, Diploma returned to Okinawa the last day of May to resume patrolling. From 4 to 31 July she swept mines in support of the final 3d Fleet raids on the Japanese mainland. After the cessation of hostilities she continued sweeping in the East China Sea-Ryukyus area and in the Tsugaru Straits into Ominato Naval Base at the northern tip of Honshu. On 20 November Diploma sailed for the west coast, arriving at San Diego 20 December. She was underway on 5 January 1946 for Mobile, Ala., and after visits there and at New Orleans arrived at Orange, Tex., 12 May. Diploma was placed out of commission in reserve there 3 September 1946. She was reclassified MSF-221, 7 February 1955.
Diploma received three battle stars for World War II service.