On 16 February 1973, the submarine exited San Diego harbor to embark upon her 11th tour of duty with the Seventh Fleet. Bilateral exercises with the South Korean and Nationalist Chinese navies again highlighted a normal peacetime deployment. This time, however, she also joined units of the Japanese Maritime Self Defense Force in ASW training operations. She returned to San Diego on 14 August and resumed operations in the southern California operating area which were highlighted by submarine against submarine exercises which included firing exercise torpedoes. Local operations occupied her through the end of 1973 and during the first five months of 1974. On 14 June 1974, she entered the Mare Island Naval Shipyard for an extended overhaul which lasted until July 1975. "Wahoo" completed post overhaul sea trials on 23 July and, after visiting Seattle, Washington, for the 1975 "Sea Fair" and conducting weapons systems tests and electronics accuracy trials off the coast of the Pacific northwest, she returned to San Diego on 28 August. She then resumed local operations — including a tour as school ship for prospective commanding officers in November and refresher training in December — which kept her busy until the beginning of April 1976.