Operation Crimp Westmoreland requested further reinforcement and US and allied forces increased to 44 battalions which would be used to directly bolster the ARVN. Australia's growing involvement in Vietnam reflected the American build up. In 1963, the Australian government had committed a small advisory team, known as the Australian Army Training Team Vietnam (AATTV), to help train the South Vietnamese forces. However, in June 1965 the decision to commit ground troops was made, and the 1st Battalion, Royal Australian Regiment—originally commanded by Lieutenant Colonel Ivan 'Lou' Brumfield—was dispatched. Supporting 1 RAR was 1 Troop, A Squadron, 4th/19th Prince of Wales's Light Horse
1965 in the Vietnam War strikes, the U.S. 173rd Airborne began another sweep through Zone D with 2,500 men and ARVN and Australian participation. The allies claimed to have inflicted 100 Viet Cong casualties. Maxwell Taylor resigned as U.S. Ambassador to South Vietnam. Taylor had earlier been opposed to the introduction of U.S. ground troops into South Vietnam, proposing instead an intensified air campaign against North Vietnam. Taylor would be replaced by Henry Cabot Lodge, Jr., who returned to Saigon for his second stint as ambassador. The New York Times reported that the 173rd Airborne suffered 10 killed and 42 wounded on its sweep through