3P Drift is spot on.
You want pilot, a commission, or NCA. In a sense they are mutually exclusive. If you go in with these choices they will immediately peg you where they have a hole. NCA on chopers?
You wnat to focus on what you really want, that is pilot. That is probably unrealistic so your focus should shift to commission in a branch - flying! - then admin etc. I am not absolutely sure but I think they have gone away from only considering you for your stated choices.
You should also consider flighter control and ATC. Both are aptitude based careers.
Once you get to OASC is the time to say "I really, really want to be a pilot"
Then you have to have some pretty solid arguments why you want to be a pilot, why the air force wants you as a pilot and a convincing argument that you do not see this as a short cut to civil aviation.
Good luck.