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
Vietnam War gun of the US army at the time and many of them were put on helicopters, to provide suppressive fire. The MAC-10 machine pistol was supplied to many special forces troops in the midpoint of the war. Two aircraft that were prominent in the war were the AC-130 "Spectre" Gunship and the UH-1 "Huey" gunship. The AC-130 was a heavily armed ground-attack aircraft variant of the C-130 Hercules transport plane. The Huey is a military helicopter powered by a single, turboshaft engine, and approximately 7,000 UH-1 aircraft saw service in Vietnam. The U.S. heavily armored, 90 mm M48A3 Patton tank