I didn't know about this! 

http://www.defence.gov.au/transitions/documents/01-07-11%20-%20DFRDB%20Guideline...

I should have been discharged medically, but my discharge signal stated 'normal.   This of course has a huge impact on pensions, commutation etc.   Luckily, I have not taken my commutation as yet so if I do get a retrospective change to a medical dee, I won't have to pay back a lot of money!