| Navy | The US Navy |
| Type | Submarine |
| Class | Balao |
| Pennant | 409 |
| Built by | Portsmouth Navy Yard (Kittery, Maine, U.S.A.) |
| Ordered | |
| Laid down | 15 Mar 1944 |
| Launched | 26 Jun 1944 |
| Commissioned | 23 Aug 1944 |
| End service | 1 Jul 1970 |
| Loss position | |
| History | Decommissioned 16 June 1967. |
Commands listed for USS Piper (409)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Cdr. Bernard Francis McMahon, USN | 23 Aug 1944 | 25 Jun 1945 |
| 2 | Lt.Cdr. Edward Latimer Beach, Jr., USN | 25 Jun 1945 |
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Noteable events involving Piper include:
25 Jan 1945
With her trials and initial training completed USS Piper (Cdr. B.F. McMahon) departs Pearl Harbor for her 1st war patrol. She is ordered to patrol south of Japan.
25 Feb 1945
USS Piper (Cdr. B.F. McMahon) sinks the Japanese guardboat Hosen Maru No.3 (111 GRT) with gunfire west of Miyake Jima in position 34º06'N, 138º22'E. (see map)
30 Mar 1945
USS Piper (Cdr. B.F. McMahon) ends her 1st war patrol at Midway.
26 Apr 1945
USS Piper (Cdr. B.F. McMahon) departs Midway for her 2nd war patrol. She is ordered to patrol in the Sea of Okhotsk.
13 Jun 1945
USS Piper (Cdr. B.F. McMahon) ends her 2nd war patrol at Pearl Harbor.
19 Jul 1945
USS Piper (Cdr. E.L. Beach) departs Pearl Harbor for her 3rd war patrol. She is ordered to patrol in the Sea of Japan.
1 Aug 1945
USS Piper (Cdr. E.L. Beach) arrives at Guam.
4 Aug 1945
USS Piper (Cdr. E.L. Beach) departs Guam for her patrol area.
11 Aug 1945
USS Piper (Cdr. E.L. Beach) sinks two small Japanese vessels with gunfire south-west of Kyushu, Japan in position 31º52'N, 129º49'E. (see map)
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