Bong Trang during Operation Rolling Stone in support of 1RAR, Operation Abilene in support of 1st US Infantry Division, Operation Denver as part of "Force Essex", and Operation Enoggera in support of newly arrived 6RAR. In May 1966 it was decided to create an Australian task force with its own tactical area of responsibility (TAOR.) Phước Tuy Province was to be designated the TAOR for the new task force. The 1st Australian Task Force (1ATF) was formed in June 1966, with a base built at Nui Dat. The New Zealand government was given the choice of allowing the artillery battery to remain at Bien Hoa under U.S command with the 173rd Airborne or integrate the battery with the new task force. The decision was made to integrate the battery into 1ATF under 105 Battery, Royal Australian Artillery which had arrived at the end of September 1965. In the 1991 movie documentary The Cu Chi Tunnels Vietcong survivors who hid in the Cu Chi tunnels during Operation Crimp said they called the artillery bombardments above them "The New Zealand Dong Dun Orchestra." As part of 1ATF, the New Zealand battery is remembered well for its role in the Battle of Long Tan on 18 August 1966, during which it played a key role in supporting the outnumbered Australian infantry from D Company, 6th Battalion, Royal Australian Regiment hold off a regimental-sized Viet Cong force. Three New Zealand artillery Forward Observers attached to D Company controlled the guns of their own battery, the two Australian batteries, and two American batteries – a total of 24 guns, in support of themselves and the rest of D Company for more than 3.5 hours firing 6-8 rounds per minute almost non-stop. In 1967 the battery's L5 howitzers were replaced by heavier and more robust American M2A2 Howitzers. Also in 1967, the first company of New Zealand infantry arrived, followed by a second company in December 1967. The two infantry companies eventually amalgamated with one of the three 1ATF battalions in March 1968 to form the "ANZAC Battalion." This practice continued with each New Zealand infantry company rotating with or within 6 months of a new rotation of Australian infantry, designated "ANZAC Battalion" each time. When the New Zealand battery was called upon to support 1ATF infantry operations, Forward Observers from the battery would accompany the Australian, New Zealand, or U.S infantry units on operations to