It returned to Subic Bay on 14 January and resumed training operations punctuated by visits to Singapore, Hong Kong and Kobe, Japan. It began operations in Vietnamese waters at the beginning of April, operating on Yankee Station to provide search-and-rescue and medical evacuation services. It departed the combat zone twice, once for upkeep at Subic Bay and later to exchange battalion landing teams at Okinawa. At the end of June, it resumed flight operations in connection with troop movements. However, instead of carrying embarked Marines inland for amphibious landings, its helicopters moved South Vietnamese troops from point to point ashore. On 29 June, "Tripoli"-assigned helicopters helped to transport 1,400 Vietnamese Marines from Tam My to the vicinity of Quang Tri City during the allied counteroffensive to recapture areas of the I Corps tactical zone, which had been overrun by PAVN during the Easter Offensive. As this operation, codenamed "Lam Son 72" progressed, "Tripoli" remained off shore, evacuating casualties and waiting should the reserves be required. That necessity came shortly before noon on 11 July, when its helicopters helped to insert the reserve Vietnamese Marines battalion, picking them up near Route 553 and landing them behind enemy lines, about north-northwest of Quang Tri City. On the 20th, "Tripoli" departed Vietnamese waters bound for the Philippines where heavy monsoons had caused extensive flooding. It reached Subic Bay on 23 July and conducted relief operations until 4 August, at which time it set course for the United States.