RAAF Headquarters, Australian Force Vietnam was established at Fairbairn in May 1966 and was then transferred to Saigon. This agency
which at times was called RAAF Element or RAAF Component, Headquarters Australian Force Vietnam formed part of CA 5969, Headquarters Australian Force Vietnam, which consisted of executive representatives from the Army, Navy and Air Force.
 
The Commander RAAF Element Vietnam (COMRAAFV), who exercised single service command of all RAAF units in Vietnam, was also Deputy Commander Australian Force Vietnam.
 
The Officers Commanding RAAF Element, Australian Force Vietnam were:  
Air Commodore   J. Dowling CBE, AFC         Jun 1966-Apr 1967  
 "      "       J.F. Lush, CBE              May 1967-Mar 1968 
 "      "       G.T. Newstead, CBE          Apr 1968-Mar 1969 
 "      "       F.S. Robey, CBE             Mar 1969-Mar 1970 
 "      "       C.H. Spurgeon, CBE, DFC     Apr 1970-Apr 1971 
 "      "       N.P. McNamara, CBE, AFC     Apr 1971-Feb 1972  
 
After a year, COMRAAFV was supported by a staff which numbered just four oficers and three airmen. By March 1968, this number had grown to twenty officers and seven airmen.

The component units of the RAAF Element were initially based at Vung Tau, Vietnam, and consisted of:

CA 2852, No.9 (Helicopter) Squadron (Iroquois Aircraft)
CA 1379, No.35 (Transport) Squadron (Caribou Aircraft)
         No.5 Airfield Construction Squadron (Detachments A & B) 
CA 1375, Base Support Flight
CA 1376, RAAF No.1 Operational Support Unit Air Transport Operations
          Centre
         RAAF Airfield Defence Guard Flight
CA 1371, RAAF No.2 (Bomber) Squadron
 
In August 1971, the Australian Government decided to withdraw its forces from Vietnam.  By 29 February 1972, all RAAF units and personnel stationed in Vietnam were returned to Australia following disbandment procedures.


Sources:

Coulthard-Clark, Chris  'The RAAF in Vietnam' pp.79-81, 320.
Historical agency address
May 1966 : Fairbairn, ACT
May 1966 - February 1972 : Saigon, Vietnam

Agency controlled unregistered

Air Transport Operations Centre