He served as an infantry officer in North Africa, where he was wounded in action, and in Greece, before being appointed to staff roles in New Guinea.
With the rank of captain, he served in the 2/8th Infantry Battalion, part of the 6th Division and was wounded during the capture of Tobruk from Italian forces.
Exploiting intelligence gained from the capture of Imperial Japanese Army documents,[8] Robertson played a key role in battles such as Kaiaipit and Dumpu.
It appears, however, that ASIS agents did not leave Chile until October 1973, after the 1973 Chilean coup d'état had brought down the Allende Government.
In the lead up to Indonesia’s invasion of East Timor in 1975, ASIS paid a Dili-based Australian businessman Frank Favaro for information on local political developments.