| Navy | The US Navy |
| Type | Submarine |
| Class | Balao |
| Pennant | 309 |
| Built by | Portsmouth Navy Yard (Kittery, Maine, U.S.A.) |
| Ordered | |
| Laid down | 27 Feb 1942 |
| Launched | 7 Apr 1943 |
| Commissioned | 31 Jul 1943 |
| End service | 1 Sep 1962 |
| Loss position | |
| History | Decommissioned 30 January 1946. |
Commands listed for USS Aspro (309)
Please note that we're still working on this section.
| Commander | From | To | ||
| 1 | Lt.Cdr. Harry Clinton Stevenson, USN | 31 Jul 1943 | 15 Jan 1944 | |
| 2 | Lt.Cdr. William Alfred Stevenson, USN | 15 Jan 1944 | 11 Feb 1945 | |
| 3 | Cdr. James Henry Ashley, Jr., USN | 1 May 1945 | 13 Aug 1945 | |
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Noteable events involving Aspro include:
17 Sep 1943
With her trials and initial training completed USS Aspro (Lt.Cdr. Harry Clinton Stevenson) departs New London bound for Pearl Harbor.
18 Oct 1943
USS Aspro (Lt.Cdr. H.C. Stevenson) arrives at Pearl Harbor.
24 Nov 1943
USS Aspro (Lt.Cdr. H.C. Stevenson) departs Pearl Harbor for her 1st war patrol. She is ordered to patrol off Formosa.
28 Nov 1943
USS Aspro (Lt.Cdr. Harry Clinton Stevenson) refuels at Midway.
1 Jan 1944
USS Aspro (Lt.Cdr. H.C. Stevenson) ends her 1st war patrol at Midway.
15 Jan 1944
Lt.Cdr. William A. Stevenson takes over command from his brother Lt.Cdr. Harry Clinton Stevenson who has developed problems with his eyesight during Aspro's 1st war patrol and was disqualified after an eye examination.
3 Feb 1944
After a short training period at Pearl Harbor USS Aspro (Lt.Cdr. William A. Stevenson) departs this base for her 2nd war patrol. She is ordered to patrol north of Truk, Caroline Islands.
15 Feb 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) torpedoes and sinks the Japanese submarine I-43 (2230 tons, offsite link) about 280 nautical miles east-south-east of Guam in position 10º23'N, 150º23'E. (see map)
28 Mar 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) ends her 2nd war patrol at Pearl Harbor.
22 Apr 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) departs Pearl Harbor for her 3rd war patrol. She is ordered to patrol off the Palau's.
14 May 1944
USS Aspro (Lt.Cdr. William A. Stevenson) and USS Bowfin (Cdr. John Corbus) torpedo and sink the Japanese army cargo ship Bisan Maru (4667 GRT) about 90 nautical miles north-west of Palau in position 08º55'N, 133º42'E.
(see map)
15 May 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) torpedoes and sinks the Japanese troop transport Jokuja Maru (6440 GRT) about 175 nautical miles north-west of Palau in position 10º10'N, 131º48'E. (see map)
16 Jun 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) ends her 3rd war patrol at Fremantle, Australia.
9 Jul 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) departs Fremantle for her 4th war patrol. She is ordered to patrol in the South China Sea.
16 Jul 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) toppes off with fuel at Darwin, Australia.
28 Jul 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) torpedoes the grounded Japanese auxiliary gunboat Peking Maru (2288 GRT) aground off Vigan Point, Luzon, Philippines in position 17º33'N, 120º21'E. The Peking Maru remains aground and is declared a total loss and abandoned. (see map)
18 Aug 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) ends her 4th war patrol at Fremantle.
10 Sep 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) departs Fremantle for her 5th war patrol. She is ordered to patrol in the South China Sea.
2 Oct 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) torpedoes and sinks the Japanese merchant cargo ship Azuchisan Maru (6886 GRT) in South China Sea west of Luzon, Philippines in position 18º25'N, 120º32'E. (see map)
14 Oct 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) ends her 5th war patrol at Saipan.
25 Oct 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) arrives at Pearl Harbor.
21 Nov 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) departs Pearl Harbor bound for Saipan.
28 Nov 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) suffers a fire and is forced to return to Pearl Harbor for repairs.
13 Dec 1944
USS Aspro (Lt.Cdr. W.A. Stevenson) departs Pearl Harbor for her 6th war patrol. She is ordered to patrol off Formosa.
2 Jan 1945
USS Aspro (Lt.Cdr. W.A. Stevenson) torpedoes and damages the Japanese landing ship Shinshu Maru (8170 GRT) south of Formosa Strait in position 22º42'N, 119º14'E. The damaged Shinshu Maru is sunk the next day by aircraft from the US Task Force 38. (see map)
11 Feb 1945
USS Aspro (Lt.Cdr. W.A. Stevenson) ends her 6th war patrol at Pearl Harbor. She was now sent to the Hunters Point Navy Yard for a major overhaul.
20 Feb 1945
USS Aspro (Lt.Cdr. W.A. Stevenson) arrives at the Hunters Point Navy Yard to begin her overhaul.
31 May 1945
With her overhaul completed USS Aspro (Lt.Cdr. James H. Ashley, Jr.) departs the Hunters Point Navy Yard bound for Pearl Harbor.
25 Jun 1945
USS Aspro (Lt.Cdr. J.H. Ashley, Jr.) departs Pearl Harbor for her 7th war patrol. She is ordered to patrol south of the Japanese home islands.
13 Aug 1945
USS Aspro (Lt.Cdr. J.H. Ashley, Jr.) ends her 7th war patrol at Midway.
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