| Navy | The US Navy |
| Type | Submarine |
| Class | Tench |
| Pennant | 418 |
| Built by | Portsmouth Navy Yard (Kittery, Maine, U.S.A.) |
| Ordered | |
| Laid down | 5 Apr 1944 |
| Launched | 7 Jul 1944 |
| Commissioned | 13 Oct 1944 |
| End service | 1 Jul 1971 |
| Loss position | |
| History | Decommissioned 6 April 1946. |
Commands listed for USS Thornback (418)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Cdr. Ernest Percival Abrahamson, USN | 13 Oct 1944 | 8 Aug 1945 |
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Noteable events involving Thornback include:
20 Mar 1945
With her trials and initial training completed USS Thornback (Cdr. E.P. Abrahamson) departs New London bound for the Panama Canal Zone for further training.
25 May 1945
USS Thornback (Cdr. E.P. Abrahamson) arrives at Pearl Harbor.
13 Jun 1945
USS Thornback (Cdr. E.P. Abrahamson) departs Pearl Harbor for her 1st war patrol. She is ordered to proceed to Saipan. But while en-route she is ordered to proceed to Guam.
25 Jun 1945
USS Thornback (Cdr. E.P. Abrahamson) arrives at Guam.
30 Jun 1945
USS Thornback (Cdr. E.P. Abrahamson) departs Guam for her patrol area off the east coast of Honshu and south of Hokkaido.
31 Jul 1945
USS Thornback (Cdr. E.P. Abrahamson) damages the Japanese submarine chaser Ch 42 (435 tons) with gunfire about 5 nautical miles east off Osaki, Honshu, Japan, in position 38º53'N, 141º35'E. (see map)
8 Aug 1945
USS Thornback (Cdr. E.P. Abrahamson) ends her 1st war patrol at Midway.
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