Treating actual, life-threatening illnesses, yes the ADF has reason to pay for the treatment but if the person has a mental health issue, then they shouldn't be working for the ADF. And if wanting to be the other sex is causing you so much distress where it really does become a mental health issue, then I may as well get a job in the ADF, claim that I'm deeply insecure of my physical appearance and wish to have certain alterations/plastic surgery done to my body. I can think of other analogies, not only working for the ADF but other government sectors. For the record, I'm not against the sex change, just the means to fund it.