Shagpile, as stated earlier in the thread, the military and civilian rules differ slightly, just as the rules between ICAO states differ slightly. Whining to a bunch of people on the internet isn't going to change that.
Having an Australian Civil Medical, doesn't entitle you to an American, Hong Kong or JAA one, any more than having a defence one does. Could all doctors conceivably issue the same medical? Yes! Are there doctors who are able to issue medicals for both civil and defence, or multiple ICAO states? Yes! Would life be a hell of a lot easier if everyone worldwide operated under the same set of rules without variations and your license and medical recognised? Absolutely! But the various states don't want people to interfere with their train set, so we're stuck sitting multiple exams, renewing multiple medicals, instrument ratings and proficiency checks to fly an identical aircraft with different letters painted on the side.
If you want to fly civil as well as military aircraft, next time you visit an ADF doctor, find one who is also on the CASA list. If none of the quacks near you are, start asking your local ADF doctor - if there's a demand there, they might look in to getting the qualification and save you both some time.