Between 1967 and 1971, all three destroyers were rotated through deployments to the Vietnam War: "Perth" and "Hobart" deployed three times, while "Brisbane" only undertook two tours. During these deployments, the destroyers were integrated into the United States Seventh Fleet. The three ships operated primarily in the naval gunfire support role, but also performed screening escort for the American aircraft carriers, and were involved in the Market Time and Sea Dragon operations, both of which aimed to prevent North Vietnamese troop and supply movements by sea. During these deployments, "Perth" was damaged by North Vietnamese shells in October 1967, and "Hobart" was accidentally attacked by United States Air Force aircraft in June 1968.