P553
| Build Group: | US S Class |
| Fate: | Returned to USN 11 July 1944 and sunk as a target, 23 March 1945. |
USS S-21 was decommissioned from the USN in 1942 and simultaneously transferred to United Kingdom where she was renamed HMS P553. She remained in American waters, based at Halifax, Canada, as an anti-submarine warfare training boat.
Events
| 19-12-1918 : | Laid down |
| 18-08-1920 : | Launched |
| 24-08-1921 : | Commissioned |
| 14-09-1942 : | Transferred to the Royal Navy as HMS P553 |
| 14-07-1944 : | Returned to USN |
| 23-03-1945 : | Sunk as target |
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