My buddy is at (or rather JUST left) AF TPS. He's been there for the last 2.5 years or so. If anyone has any questions you want me to relay, I'll see what I can do.
I had the chance to go visit TPS about 5 or 6 times, including a graduation and a couple flights in their gliders. Great group of people, and being around it you can't help but want to be a part of it. In fact ONLY when I am around TPS do I wish I had been an engineering major... if all the chips fell in place it is certainly something I would like to have been able to do (NTPS or AF).
I'm sure this is common knowledge, but the Navy sends someone to AFTPS, and vice versa. Also, Navy TPS does not require a technical degree, but it is strongly recommended. I haven't asked anyone, but I would be willing to bet the chances of a PoliSci major getting picked up for TPS to be about zero.