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The 1st Battalion, Royal Australian Regiment (1RAR) is a light infantry battalion formed in 1945. MacGregor's service with the unit during the Vietnam War (1965–1966) marked one of its most pivotal operational periods, including significant actions at Fire Support Base Coral and in .

: A more recent collaborative work detailing how the Australian Tunnel Rats fought the Viet Cong. 1RAR Context Sandy 1rar

: MacGregor was awarded the Military Cross for his bravery and leadership in South Vietnam. The 1st Battalion, Royal Australian Regiment (1RAR) is

: He documented these experiences in several books, including: The 1st Battalion