Milligan was born on 16 June 1936 at Taree,
New South Wales, and educated at Taree High
He joined the 13th National Service Training
Battalion in January 1955, served with the
17/18th Infantry Battalion, CMF, (Citizens'
Military Forces) from April 1955 to
September 1957, 1 RTB (1 Recruit Training
Battalion) from September 1957 to November
1957, 4 RAR from November 1957 to May 1958
and 2 RAR from May 1958 to January 1961. He
applied for entry to OCS (Officer Cadet
School) Portsea in October 1960 and was
selected for entry in January 1961.
In December 1961, Colour Sergeant Milligan
graduated from OCS Portsea as Dux of his
Class, being awarded the Governor General's
Medal, the Staff Prize, the Field Prize and
the Skill at Arms Prize.
He was posted to PIR (Pacific Islands
Regiment) as a Platoon Commander, ADC to the
Commander of the 1st Division then 2iC of C
Company, 5 RAR, on 24 January 1966.
On 13 February 1967, 5 RAR was taking part
Operation Beaumaris and tasked with a
cordon and search of An Nhut, a village of
approximately 1,000 people, about six
kilometres southeast of the Australian Task
Force base at Nui Dat.
At about 0900h on the following day the OC
of C Company held an orders group. As the
members left the group, a member triggered a
large explosion from a well concealed mine,
causing death and injury. Major Bourne,
Captain Milligan and Captain Williams were
killed outright and five other men were
Captain Milligan's remains were returned to
Australia and he was buried at the Northern
Suburbs Cemetery, Sydney, on 23 February