I don't believe the AF has enlisted pilots if you don't have a 4 YR Degree as much as it pains me to say Army will be the way to go you will be as Steve said a CWO but an O none the less. Plus you can do 20 and retire by 40 and still be able to fly as a part time job or hobby.
As far as wasting your brain in the Military that is crazy I have 2 degree's thanks to the Military and when I get out I can become a PA in a year with all the training I have.
I tell all of my guys diving is not for ever get a degree you can get it online in the Navy