[1] 1 Tp A Sqn 4/19 PWLH was a Regular sub unit of a primarily Citizens Military Force light cavalry regiment.

[2] Working primarily with 1 RAR, the troop was placed under the control of the US 173rd Airborne Brigade, operating in an area to the north of Nui Dat in Phuoc Tuy Province.

[1] Under the command of Lieutenant (later Captain) Robert Hill, initially the troop was deployed with only eight carriers as at the start of the Australian commitment to the ground war in Vietnam, the Australian government intended to limit the size of Australia's forces to a single infantry battalion tasked with maintaining security around the American base at Bien Hoa.

[3] In September, however, as it became clearer that there was a wider role for Australian ground forces the size of the troop was increased to 13 personnel carriers and two mortar carriers and after that the troop was used in a variety of roles including infantry mobility, manoeuvre, direct and indirect fire support, casualty evacuation and providing a medium lift stores transportation capability.

[9] These included both cavalry and armoured personnel roles, such as fire support, reconnaissance and offensive manoeuvre, as well as serving as infantry command and control vehicles, troop transport, stores portage, and casualty evacuation.

[3] Whilst 1 APC Sqn was involved in many operations in the six months that it was in existence, probably its most notable action was on 18 August 1966 in what later became known as the Battle of Long Tan.

[11] Having picked up 'A' Company from their lines at Nui Dat, the column received permission and set off across country in the pouring rain at 18:00 hours.

[3] Upon seeing the arrival of the APCs the enemy broke off its attack, the survivors melting away back into the jungle and leaving the Australians in possession of the battlefield.

[3] In January 1967, after a re-organisation of units of the Royal Australian Armoured Corps, 1 APC Sqn was re-designated as 'A' Squadron, 3rd Cavalry Regiment.