That's a VERY good idea!
I don't have the form with me anymore but I found basically an ad verbatim copy of what the ADF like addressed by specialist medical reports, so hopefully this'll help when you rock up:
1. Confirm the nature of the problem/diagnosis.
2. Describe the limitations it places upon the applicants functional capacity.
3. Describe any limitations upon duties because of safely considerations (eg. inability to work alone or at heights, necessity to practice 'universal precautions').
4.What is the medium and long term prognosis for the condition?
5.Does the condition require any ongoing medication, specialist review or potential demands on the ADF as a health care provider?
Of course a simple letter that doesn't say too much other than 'this man is basically fine' that you hand to your doctor at the medical may do the trick. Either way, I hope it goes well for you mate.