That depends. You go to the fuge after select the type of aircraft that you will be flying. There are certain aircraft specific G profiles that you will undergo in the fuge. This is according to a buddy of mine who is now flying Echos.
Back to the meat of your question. If the instructor pilot comes from a fighter community then he or she has undergone the fuge from way back when. If they are a FAIP (First Assignment IP) it is my understanding that they haven't. Mind you this is for T-38s.
That being said you could throw the T-37, T-6, and T-1 in there. None of those do you need G training for. It's a build as you go type of thing, especially for the helo guys that fly T-6s now.
Believe it or not T-37 has the highest G onset rate of any USAF
aircraft. The T-6 can pull some good numbers too, enough that there is a G-suit system in the a/c. The primary trainers (ie. Tweet, Texan, and Tormentor) are where most pilots develop their G tolerance.
Don't forget the squids. The T-34 has blacked students out at 3Gs before. IIRC a aerospace physio LT
told me that the T-34 GLOCs more aircrew than any other fleet airplane.
[Edited 2007-10-13 19:35:13]
Learning to fly, but I ain't got wings.