| Navy | The US Navy |
| Type | Patrol craft |
| Class | PC-461 |
| Pennant | PGM-21 |
| Mod | Patrol gunboat |
| Built by | Consolidated Shipbuilding Corp. (Morris Heights, New York, U.S.A.) |
| Ordered | 24 Jul 1943 |
| Laid down | 11 Apr 1944 |
| Launched | 25 May 1944 |
| Commissioned | 22 Nov 1944 |
| End service | |
| History | |
| Former name | PC-1552 |
Commands listed for USS PGM-21 (PGM-21)
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 | Lawrence Gardiner, USNR | 22 Nov 1944 | Late 1945 |
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Notable events involving PGM-21 include:
8 Apr 1945
USS Billfish (Lt.Cdr. L.C. Farley, USNR) conducted exercises off Pearl Harbour together with USS Staff (Lt. W.A. Upton, USNR), USS Florikan (Lt. D. Hima, USN), USS PGM-21 (Lt. L. Gardiner, USNR) and USS Torsk (Cdr. B.E. Lewellen, USN).
15 Apr 1945
USS Bumper (Cdr. J.W. Williams, Jr., USN) conducted exercises off Pearl Harbour together with USS Pruitt (Lt. D.B. Harby, USNR), USS Seagull (Lt. W.S. Hall, USN), USS PGM-21 (Lt. L. Gardiner, USNR), USS Jack (Lt.Cdr. A.S. Fuhrman, USN) and USS Ray (Cdr. W.T. Kinsella, USN).
17 Apr 1945
USS Bumper (Cdr. J.W. Williams, Jr., USN) conducted exercises off Pearl Harbour together with USS Pruitt (Lt. D.B. Harby, USNR) and USS PGM-21 (Lt. L. Gardiner, USNR).
22 Apr 1945
USS Capitaine (Lt.Cdr. E.S. Friedrick, USN) conducted exercises off Pearl Harbour together with USS Pruitt (Lt. D.B. Harby, USNR), USS PGM-21 (Lt. L. Gardiner, USNR), USS Muskalunge (Lt.Cdr. L.A. Lajaunie, Jr., USN) and USS Segundo (Cdr. James D. Fulp, Jr., USN).
23 Apr 1945
USS Capitaine (Lt.Cdr. E.S. Friedrick, USN) conducted exercises off Pearl Harbour together with USS Pruitt (Lt. D.B. Harby, USNR), USS PGM-21 (Lt. L. Gardiner, USNR), USS Muskalunge (Lt.Cdr. L.A. Lajaunie, Jr., USN) and USS Segundo (Cdr. James D. Fulp, Jr., USN).