I agree with most of the others, you need to just apply and see what happens. That being said, many Air Guard units hire based on their needs and if they have anyone in the unit applying. For recruiting purposes, its best that they hire someone from within the unit. It shows guys thinking about joining up with them "hey, maybe you too can fly this shiny jet one day..." without so many words.

I interviewed with two ANG units (one F-16 unit, one KC-135 unit) with some contacts and both slots were filled by, you guessed it, members of the unit. Getting a guard UPT slot is a dime a dozen, but don't let some of these other guys discourage you....

If we all had a crystal ball though, we probably wouldn't be flying...