II Corps on 15 July. On 22 July, near the end of a shore bombardment operation, a premature explosion occurred in the barrel of the forward gun turret; casualties were limited to one sailor with a fractured wrist, but the turret was unusable. On the ship's return to Subic on 3 August, the damaged turret was removed, but as the replacement turret would not arrive until September, Brisbane would complete the deployment with only a single gun turret. After the completion of maintenance, Brisbane returned to duty on 23 August, but instead of gunline duties, was assigned as the head of the escort screen for the aircraft carrier . The ships were deployed to Yankee Station, with Brisbane and (plus other destroyers on occasion) performing escort and plane guard duties. On 12 September, Oriskany and Perkins departed, and were replaced by and respectively. On 14 September, Brisbane sailed to Subic for maintenance and fitting of the replacement turret, then departed on 1 October for Sydney, having been relieved by the Daring-class destroyer two days earlier. Arriving on 13 October, Brisbane was almost immediately docked for a major refit, which lasted until 15 July 1970. Brisbanes tour was considered quieter than those experienced previously by Australian ships. This, combined with the damage to the forward gun turret and other defects, meant that the destroyer only fired 7,891 shells during the six-month deployment. Two officers from the ship were Mentioned in Despatches, while other personnel awards included a British Empire Medal and 25 Naval Board commendations. Second deployment On 29 March 1971, Brisbane relieved Perth of Vietnam duties. The ship was assigned to Military Region 3 for gunfire support duties, and arrived on 5 April. Shortly after, the destroyer was moved south to Military Region 4. She returned to Military Region 3 on 15 April. The first period on the gunline during that time concluded on 20 April, during which gunfire support operations had occurred on only 11 of the 16 days. The destroyer returned to the gunline on 15 May, with Brisbanes commanding officer tasked as the overall commander of gunfire operations; the only time the position was held by a RAN officer. Brisbane was assigned to operate near the Demilitarized Zone. The ship was relieved on 31 May and sailed to Danang. The destroyer was then assigned to escort the carrier . During 3 and 4 May, Brisbane was detached