He was a vietnam vet and army major who later had special duties related to training soldiers in bush survival and advising our remote northern NORFORCE corps. He wrote a lot of the Australian army manual for survival training in the 1980's and after the TV series retired close to my home state in the rainforest. I believe he sold up and moved back down south just recently as his house was reported for sale in the media a while back. I wonder if he is regretting that decision as those southern states are now locked down with no movement by people more than 5 km from home allowed until they all get vaccinated.