"Sydney" left for her twenty-fourth voyage to Vietnam on 14 February 1972; the troopship and the destroyer escort reached Vũng Tàu on 28 February, where 457 Australian soldiers from various units boarded. They left the next day, and "Sydney" reached Townsville on 9 March before arriving in her namesake city three days later, concluding the military involvement of the RAN in the Vietnam War. "Sydney" underwent a refit between 22 May and 20 October, then departed on 1 November for her twenty-fifth journey to Vietnam, carrying defence equipment and foreign aid supplies for South Vietnam and the Khmer Republic. "Sydney" and the destroyer "Vampire" reached Vũng Tàu on 23 November, and sailed a day later with miscellaneous Australian equipment aboard. During the return voyage, "Sydney" encountered the disabled merchant ship "Kaiwing", and towed her to Hong Kong for repairs, arriving on 30 November.