to provide cover for the repatriation of prisoners-of-war to North Vietnam. The operation did not go ahead, as only 13 of the 570 prisoners wanted to return to North Vietnam, and the North Vietnamese government refused to accept them. Brisbane returned to carrier escort duties, where she remained until sailing to Hong Kong for maintenance on 12 June. On 24 June, Brisbane was assigned back to gunline duties in Military Region 3. Activity was minimal, and the ship was redeployed to Military Region 4 on 26 June. Foul weather prevented gunfire support operations until 30 June, but the rate of activity increased, with 60 fire missions completed by the end of the three-week period. In mid-July, after a short stint back in Region 3, Brisbane sailed to Subic for maintenance and leave. On 15 August, the destroyer commenced gunfire support operations off the Demilitarized Zone. A spike in activity had resulted in the deployment of two gunfire support ships, with Brisbane and rotating between being the active vessel and being on 15 minutes standby to provide assistance. On 21 August, Berkeley was relieved by . Of the 7,231 shells fired during the second deployment, 2,127 were fired from 15 August onwards, which caused a problem as the rate of fire would cause the gun barrels to come up for replacing a week before the destroyer was due to rotate off the gunline. The amount of wear had yet to compromise accuracy, and the destroyer was instructed to continue gunfire missions, while the cruiser and the destroyer were deployed to the gunline in support of Brisbane; the Australian destroyer only firing if targets were out of the other ships' range or they were otherwise unavailable. Brisbanes second Vietnam deployment concluded on 5 September. During 1971, the Australian government decided to withdraw all forces from Vietnam by the end of the year; Brisbane was the last ship to make a combat deployment to Vietnam, and was not replaced when the deployment ended. Brisbane received the first of two battle honours, "Vietnam 1969–71", for her Vietnam service. Personnel awards for the deployment included 24 Naval Board commendations, two personnel Mentioned in Despatches, and the appointment of the ship's commanding officer as a Commander of the Order of the British Empire. 1970s and 1980s On 11 March 1974, Brisbane was docked for a major refit. This concluded on 3 October, but the destroyer remained