In December 1969, B Squadron was re-designated A Squadron, while in December 1970 A Squadron was in turn re-designated C Squadron. By late-1970 Australia was beginning to reduce its commitment to the war and the size of 1ATF was again reduced from three infantry battalions to two. The tanks, however, continued operations and were involved in heavy fighting at Long Khanh on 6–7 June 1971, as well as numerous smaller actions. The last elements of the regiment were subsequently withdrawn from Vietnam in September 1971. A total of 58 Centurions had served in Vietnam; 42 had suffered battle damage, of which six were beyond repair, while two crewmen had been killed in action.