NINJADAN.....
Sorry I didn't answer your preferences questions in the msg I sent.
When I arrived I had my preferences at RAAF:5, ARMY:3, NAVY:1.
I was told what I told you. It doesn't matter to change it whilst your there but you must know things about all 3 services, which isn't hard I didn't know much about Army/Navy (because these are helicopters, all I was interested in is fixed wing). I studied these 2 whilst there.
The Navy will give you a service brief to try and sway you to them. He will tell you (should be lieutenant Kidd) that you can change your preferences. All you need to do is go to the PSA building (through the sim door, its a little portable building) and ask them to change them for you. Also when you go to sit your OSB interview the Wing Commander will ask you if you would like them changed.