Sounds like a bloke I once worked with, who put it over many people (including me) for quite a while. Quite aside from his illustrious career in the army (which he would have to have joined at age 5 to have done everything he claimed) and driving an FJ Holden taxi with a million miles on the clock, he was holder of the world upside down flying record.
During the time I knew him, he was promoted from Major to Colonel, and organised the Anzac day ceremonies for a large area while impersonating an army officer. He was eventually convicted, but about 20 years later turned up again as a retired Brigadier in a country town, where he split the local RSL, half of whom knew he was a fraud, and half of whom believed his claim that his war work was so secret that his name was removed from army records.