Just going to copy/paste what I put in another thread about enlisting. Depends on the unit you want to enlist in, but results may vary. The unit I'm enlisted in is a fighter unit btw.
Just throwing my .02 out here from the experience I have gone through, I agree with what brabus is saying but I also disagree. I am in a similar situation with my unit. They only hire from within and have only picked off the street one time in that past 10 years. I started college late at 20, enlisted at 21 with a 20k bonus with a year of college under my belt, went to BMT and crew chief tech school which were 8 months, so had to miss a year of school. Now graduating at 25 with equivalent of about year and a half of TIS being a DSG, great contacts, awards, back seat ride in the Viper, gained a lot of respect for the enlisted side, and got to enjoy college while only having to give up one weekend a month. Enlisting did delay the process since I will be putting in my first application next month, but I wouldn't have changed a thing. ALSO, the monthly GI bill for school is a nice $780 a month, and just having a military ID is very helpful. As for AFSC's I was always told to try and get AFE (aircrew flight equipment) or something in OPS, but none were available. So crew chief was the next best, I'm in phase docks so not much exposure to pilots, but just walk on over to OPS and majority of guard pilots that I've spoken to are more than willing to sit down and talk about the slot and anyway they can help.