Uh 20 k for school, lucky you are. This shouldnt even be a question...go to school!!!! You will regret not doing it. The more education you have the higher your ranking in the Air force and the rest of your life, or on the flip side you could be uneducated and having to break your back the rest of your life and I can tell you the results first hand
And by the way, I wish you the best in the A.F. You rock just for considering it.