In 1945 Australia sent three units to Japan as part of the British Commonwealth Occupation Force (BCOF). Originally known as the 65th, 66th and 67th Infantry Battalions, they were raised from Australian divisions stationed in New Guinea at the end of the Second World War.
On 23 November 1948, the battalions were renamed the First, Second and Third Battalion, The Australian Regiment, respectively. The prefix "Royal" was granted by King George VI on 31 March 1949.
3RAR was in Japan when it was committed to the US-led United Nations Command forces on 26 July. Volunteers brought the battalion up to its full strength of 960 troops on 11 September, and training was carried out in Japan.
On 28 September 1950, 3RAR landed at Pusan, South Korea. The battalion was part of the 27th British Commonwealth Infantry Brigade. Troops from 3RAR were rotated and replaced on an individual basis, and 3RAR remained in Korea for the duration of the conflict.
Author summary: Australian regiment history described.