Balao class submarine
1,550 Tons (surfaced)
2,429 Tons (submerged)
311.6' x 27' 3" x 16' 10"
10 x 23" Torpedo Tubes
with 24 torpedoes
1 x 5" deck gun
1 x 40mm gun
1 x 20mm cannon
Built by Portsmouth Naval Shipyard at Kittery, Maine. Laid down December 27, 1942. Launched April 7, 1943. Commissioned July 31, 1943 with LtCdr Henry C. Stevenson in command.
After a shakedown cruise off Portsmouth, NH and Newport, RI; and New London, CT. Afterwards, departed on September 17, 1943 via the Panama Canal to Pearl Harbor arriving October 18, 1943.
First War Patrol
Departed Hawaii on November 24, 1943 and made a refueling stop at Midway Atoll on November 28 before proceeding to the Formosa and Sakishima Gunto. On December 15, she spotted a Japanese convoy consisting of one tanker, two freighters, and two escorts. The submarine fired torpedoes at the tanker and claimed a hit, but apparently failed to inflict serious damage.
Fifth War Patrol
On September 10, 1944, Aspro departed for her fifth patrol to the South China Sea. While in transit to the patrol area, on September 30 off northeast coast of Luzon where she encountered a convoy of seven or eight vessels protected by four escorts. She torpedoed and heavily damaged a freighter. Two days later, she attacked a tanker and heard breaking-up noises for 10–15 minutes. Through her periscope, she saw her victim listing to starboard with her bow high in the air. Soon Aspro lost sight of the ship and claimed to have sunk her. About an hour later, Aspro attacked another freighter in the same convoy. The ship was seen sinking in a vertical dive, stern first.
Next, Aspro rendezvoused with USS Hoe SS-258 and USS Cabrilla SS-288 to form a wolf pack. On 7 October, Hoe spotted a large convoy consisting of about a dozen ships. At 04:55, Aspro fired four torpedoes at a freighter and witnessed the ship's sinking. Shortly thereafter, she terminated her patrol at Saipan on 14 October and then proceeded to Pearl Harbor where she arrived on 25 October.
On October 6, 1944 spotted Japanese convoy MATA-28 after departing San Fernando. At 8:00am, fired three torpedoes by periscope at a tanker and claims one hit, but actually achieves no results.
During World War II, Aspro earned seven battle stars.
On November 16, 1962 sunk as a target off San Diego, California.
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January 10, 2018