On 6 September 1977, she departed San Diego to transfer to the Atlantic Fleet. Steaming via the Panama Canal; Cartagena, Colombia; Miami, Florida, and Savannah, Georgia, she arrived at New London, Connecticut, on 15 October. On 1 November, she began training a crew from the Iranian Navy scheduled to take possession of her sister-ship sometime the following year. That duty continued until the summer of 1978 and included a six-week Caribbean deployment early in 1978 in support of ReadEx 1–78. On 6 July 1978, the submarine began an extended overhaul at the Philadelphia Naval Shipyard to prepare her to be handed over to Iran and renamed "Nahang". These plans were cancelled on 31 March 1979 following the Iranian revolution. "Wahoo" was instead decommissioned on 27 June 1980 and cannibalized for parts for the other "Tang"s that were still in service to foreign governments. ex-"Wahoo" was stricken from the Naval Vessel Register on 15 July 1983, and in November 1984 her hull was sold for scrap.