| Navy | The US Navy |
| Type | Submarine chaser |
| Class | SC-497 |
| Pennant | SC-521 |
| Built by | Annapolis Yacht Yard Inc. (Annapolis, Maryland, U.S.A.) |
| Ordered | 1 Apr 1941 |
| Laid down | 5 May 1941 |
| Launched | 1 Feb 1942 |
| Commissioned | 15 Apr 1942 |
| Lost | 11 Jul 1945 |
| Loss position | 11° 03'S, 164° 50'E |
| History | USS SC-521 foundered in heavy weather off Santa Cruz in the Solomon Islands in position 11º03'S, 164º55'E at 0852L/11. She was en-route from Guadalcanal to Pearl Harbour with three other submarine chasers. There was no loss of life as the crew were picked up by USS SC-502 and USS SC-1047 which then returned to Guadalcanal together with USS SC-1327. |
Commands listed for USS SC-521 (SC-521)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | Kendall Endicott Read, USNR | 15 Apr 1942 | Mid/late42 |
| 2 | Thomas Handasyde Perkins Whitney, USNR | Mid/late42 | Late 1942 |
| 3 | Lt.(jg) Frank Herman Scrivner, USNR | Late 1942 | 9 Dec 1943 |
| 4 | Frederick W. Freeman, Jr., USNR | 9 Dec 1943 | 3 Sep 1944 |
| 5 | S W Crocker, USNR | 3 Sep 1944 | Mid 1945 |
| 6 | C R Partridge, USNR | Mid 1945 | 11 Jul 1945 |
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