On 29 January 1945, daring to lie at anchor in broad daylight for 4 hours one mile (1.6 km) off the coast, Charr sent two men ashore in a rubber boat to rescue a downed aviator.

After refit, Charr cleared on her second war patrol, cruising in the Flores, Java, and South China Seas, and along the southern coast of Taiwan.

Finally, early in the morning of 7 April 1945, Charr maneuvered into firing position to find Isuzu down by the stern and listing, evidence of successful attack by Gabilan.

At this late date in the war, targets were few, for Charr's sister submarines, as well as air and surface forces, had broken the back of Japan's navy and merchant fleet.

Charr remained at Fremantle from 26 July to 29 August 1945, then sailed for repairs at Pearl Harbor and training at Guam until 30 January 1946 when she reached San Diego, her newly assigned home port.

With her conversion completed 19 November 1951, she prepared for overseas deployment, and on 26 March 1952, she sailed to support United Nations forces in Korea, conducting patrols throughout the Far East.

On 26 September 1961, a broken coupling allowed sea water to flood the engine room of the Charr while submerged to 100 feet 150 miles off the coast of California.