Jallao was a fleet submarine, SS-368, named for a fish of the Gulf. Manitowoc Shipbuilding, on Lake Michigan, launched her on 12 March 1944. Lieutenant Commander J. B. Icenhower commissioned her on 8 July 1944. Like the other Manitowoc boats she went down the Mississippi in a floating dock and out through New Orleans to the Pacific.
Her first war patrol put her with Pintado and Atule in a wolf pack called Clarey's Crushers. On 9 October 1944 she left Pearl Harbor. The patrol ran into the Leyte battle. On the night of 25 October, off Cape Engaño, the light cruiser Tama was already damaged. An aerial torpedo had hit her during the day. That hit is not credited to one ship. Jallao sank her.
She made three more patrols. On 11 August 1945 she sank the freighter Timoko Maru. She reached San Francisco on 28 September 1945. She was decommissioned at Mare Island on 30 September 1946, recommissioned in 1953, and later transferred to Spain.