High Quality Content by WIKIPEDIA articles! 1st Armoured Regiment is an armoured regiment of the Australian Army and is the senior regiment of the Royal Australian Armoured Corps. Formed as a tank unit in the new Australian Regular Army on 7 July 1949, the regiment subsequently saw service during the Vietnam War. Today, the unit is based in Darwin as part of the mechanised 1st Brigade, and is the only armoured unit in the Australian Army to be equipped with main battle tanks, operating the M1A1 Abrams AIM.