547 Signal Troop in Vietnam, 1966 to 1971

In 1966, Prime Minister Harold Holt announced an increase in Australia’s contribution to the defence of South Vietnam. A signals intelligence support unit – 547 Signal Troop – was deployed to Vietnam following this announcement. 547 Signal Troop intercepted enemy (Viet Cong) communications, and identified and located enemy radio transmitters through direction-finding from airborne and ground-based facilities. Tactical intelligence was then produced for the Australian Task Force Commander in Vietnam. 547 Signal Troop worked as part of an integrated, cohesive effort with US Direct Support Units.

547 Signal Troop started out as a small team of 15 Australian Military Forces personnel deployed to Nui Dat. Personnel numbers grew to 35 by the end of 1967, as 547 Signal Troop established itself as a lead Direct Support Unit in the overall effort in Vietnam.

AUM 352 ARDF Section: Air/Ground Comms, and ARDF Plotting Board Jan 1969
AUM 352 ARDF Section: Air/Ground Comms, and ARDF Plotting Board Jan 1969


Progress Reports


Special Agent Reports


 Airborne Radio Direction Findings


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Acknowledgement of Country

We acknowledge the Traditional Owners and Custodians of Country throughout Australia and their continuing connections to land, sea and communities. We pay our respects to them, their cultures and their Elders; past, present and emerging. We also recognise Australia's First Peoples' enduring contribution to Australia's national security.

Authorised by the Australian Government, Canberra