Actually, as long as you tell the truth and pass the pee test, you'll be fine. Lots of folks "experimented" during their school years. What sets them apart is that the experimentation ended before they applied to the USAF. The USAF/ANG zero tolerance stance is clear. What you did before you signed up is completely different. Having been in an ANG unit, we hired dudes for UPT with bigger blemishes. We figured they were young/stupid, they owned up to being young/stupid, and they were ultimately a great fit. Good luck.