In August 1989, the UN proposed an observer mission to monitor the withdrawal of Vietnamese forces from Cambodia and supervise an internal peace process between the four factions.
In late March 1992, UNTAC was established under the 1991 Paris Agreements to supervise a cease-fire and general election in Cambodia.
The advanced party established an Australian HQ and provided basic radio communications to the 4 military factions headquarters.
The Australians (under the command of Lieutenant Colonel Russell Stuart) were among the first UN troops in Cambodia, to provide communications support to UNAMIC which was tasked to set in motion the peace process and pave the way for the deployment of UNTAC.
UNAMIC's mandate ended in March 1992 and was absorbed into UNTAC at its establishment in United Nations Security Council Resolution 745.
From 11 May to 9 September 1992, a Movement Control Group (MCG) comprising seven RAN, 16 Army and seven RAAF personnel joined UNTAC.
The MCG included a headquarters and nine three-person teams, and coordinated the reception and movement of forces during UNTAC's main deployment phase.
September 1993 of the FCU, a transit camp was built and guarded by a small group of Arms Corp volunteers named security platoon.