| Navy | The US Navy |
| Type | Motor torpedo boat |
| Class | ELCO 77' |
| Pennant | |
| Built by | Electric Launch Company Ltd. (Elco), (Bayonne, New Jersey, U.S.A.) |
| Ordered | 17 Sep 1940 |
| Laid down | 2 Dec 1940 |
| Launched | 11 Apr 1941 |
| Commissioned | 13 Jun 1941 |
| End service | 10 Nov 1943 |
| History | Stricken on 10 November 1943. |
We don't have any commands listed for USS PT 21
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