| Navy | The US Navy |
| Type | Submarine |
| Class | Balao |
| Pennant | 398 |
| Built by | Portsmouth Navy Yard (Kittery, Maine, U.S.A.) |
| Ordered | |
| Laid down | 14 Oct 1943 |
| Launched | 5 Feb 1944 |
| Commissioned | 9 May 1944 |
| End service | 1 Aug 1970 |
| Loss position | |
| History | Decommissioned 1 August 1970. Stricken 8 August 1970. Sunk as a target by USS Salmon (SS-572). |
Commands listed for USS Segundo (398)
Please note that we're still working on this section.
| Commander | From | To | ||
| 1 | Lt.Cdr. James D. Fulp, Jr., USN | 9 May 1944 | Jun 45 ? | |
| 2 | Stephen L. Johnson, USN | Jul 45 ? | Aug 45 ? | |
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Noteable events involving Segundo include:
26 Jun 1944
With her trials and initial training completed USS Segundo (Lt Cmdr James D. Fulp,Jr.) departs New London bound for Pearl Harbour.
25 Jul 1944
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) arrives at Pearl Harbour.
21 Aug 1944
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) departs Pearl Harbour for her 1st war patrol. She is ordered to patrol in the Philippines.
3 Sep 1944
USS Segundo (Lt Cmdr James D. Fulp, Jr.) arrives at Saipan to refuel, and then resumes her patrol later that day.
21 Oct 1944
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) ends her 1st war patrol at Majuro.
16 Nov 1944
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) departs Majuro for her 2nd war patrol. She is ordered to patrol in Luzon Strait.
6 Dec 1944
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) torpedoes and damages the Japanese merchant cargo ships Kenjo Maru (6933 GRT), Yasukuni Maru (5794 GRT) and Shinto Maru (1215 GRT) west of Dalupiri Island, Philippines in position 18º57'N, 120º58'E.
Shinto Maru is sunk later that day by US aircraft, the Yasukuni Maru is beached and declared to total loss and the Kenjo Maru is sunk the next day by USS Trepang. (see map)
5 Jan 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) ends her 2nd war patrol at Guam.
1 Feb 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) departs Guam for her 3rd war patrol. She is ordered to patrol in the East China Sea.
11 Mar 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) torpedoes and sinks the Japanese merchant cargo ship Shori Maru (3087 GRT) off southern Korea in position 34º25'N, 127º54'E. (see map)
26 Mar 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) ends her 3rd war patrol at Pearl Harbour. In late April she departed for her 4th war patrol in the East China and Yellow Seas.
29 May 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) sinks 7 Japanese sailing vessels with gunfire in the Yellow Sea in position 37º08'N, 125º24'E. (see map)
3 Jun 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) sinks the Japanese merchant sailing vessel Anto Maru No.94 off Jinsen, Korea in position 36º41'N, 125º23'E. (see map)
7 Jun 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) sinks a small Japanese ship with gunfire in the Yellow Sea in position 37º42'N, 124º02'E. (see map)
9 Jun 1945
USS Segundo (Lt.Cdr. J.D. Fulp, Jr.) sinks two small Japanese ships with gunfire in the Yellow Sea in position 39º08'N, 123º10'E. (see map)
11 Jun 1945
USS Segundo (Lt.Cdr. James D. Fulp, Jr.) torpedoes amd sinks the Japanese merchant cargo ship Fukui Maru No.2 (1591 GRT) in the Yellow Sea off the Shantung peninsula in position 37º11'N, 123º23'E.
(see map)
10 Aug 1945
USS Segundo (Lt Cmdr Stephen L. Johnson) departs Midway for her 5th war patrol, and is ordered to patrol in the Sea of Okhotsk.
29 Aug 1945
USS Segundo (Lt.Cdr. S.L. Johnson) encounters the Japanese submarine I-401 off the northeast coast of Honshu, and after negotiations placed a prize crew on board the Japanese submarine. Both submarines then proceeded to Tokyo Bay.
31 Aug 1945
USS Segundo (Lt.Cdr. S.L. Johnson) enters Tokyo Bay.