Tom,
The Air Force went to a dual track system in 1995 I believe. All students fly the T-6 now, then depending on how well they do in T-6's they get FAR'ed or TTB'ed (old term, I know) the fighter guys fly T-38's and the heavy drivers fly the T-1. The different part is all bomber assignments come out of the T-38 track...going on 21 years now.