While there are some exceptions to this, the guys who go to Fighter Weapons School in the AF are largely guys who went to their operation fighter as a Lt.
I have worked for a superior Wpns Officer who was a former OV-10 FAC, and I know of a couple that were FAIPs, but the vast majority were first assignment guys who then went ops to ops or ops to FTU.
You run the risk of never becoming a "patch wearer" if you stay in AETC for your first tour--not a given but the odds say its a tougher road. Other than wanting to be the absolute best fighter pilot you can be, what are the downsides of not going to FWIC? Historically in the F15 community, squadron commanders are either A) Patch wearers or B) below the zone to Maj/Lt Col or C) both! Again...there are some darn fine officers out there who have been great squadron commanders without doing any of that, but I think most would agree they are the exception and not the rule. Certainly, they had to work very hard to rise above the competition to be competitive...and the patch does seem to make a huge difference.
Now...does it seem fair that a decision made at the Lt. point in a career can have such long lasting ramifications? Probably not, but you need to know the rules going in. If you take an AETC assignment, you will find upgrading to IP once you get to the fighter squadron and are a mid-level captain may be easier for you than that brand new captain with 600 fighter hours. However, when the decision is made between you and him (or her....now in 2002) to decide who goes to weapons school next, don't be surprised if the other candidate gets the nod. (The same can be often be the case with the "who next into the upgrade" decision). This is because FWIC is a very expensive program in training costs and man hours, and the AF wants its investment paid pack as long as possible. If your career is typical, you'll have 1 operational tour after FWIC before you need to go to a staff/school tour. On the other hand, that bright, shiny 3-4 year guy (with your FAIP tour you've been in about 6-7) has a full tour extra to give back to the squadrons the training he has gotten. Just so you know--this isn't pure discimination against FAIPs. There are quite a few guys in the F15 world who flew A-10s, F-111s, F-4s/RF-4s, and OV-10s...and generally very few if any any made it to FWIC. Same rule also applies to former WSOs.(Again...likely a FEW exceptions) I don't know if the F16 community is the same--maybe some of those board regulars can throw in their 2 cents.
Not trying to rain on anyone's parade--just want you to understand some of the facts. There are plenty of exceptions to these rules, and oh by the way...you don't have to be a patch wearer to have a great career and to contribute to your unit, your weapon system community, and your country. However, if you think walking into the squadron with 1000 T-38 hours will make you more competitive down the road in your career, you may be unpleasantly surprised. If you want to do it because you think you would enjoy the experience, you enjoy teaching, and you feel like you can make a positive impact...then by all means volunteer for the job. If your goal is to be "the man" running the weapons shop in your fighter squadron or one day being an Squadron, Ops Grp, or Wing CC...I'd advise going operational at the earliest opportunity, provided you are given a choice.
Good luck--you will have wings on your chest either way, and its a great way of life.