Nope, at UPT, whatever your previous flight time, you start out like the guy who has never been in a plane. T-6, then split to either T-1 for heavies or T-38C for fighters/bombers, then RTU on your assigned plane-major weapons system, in AF speak.
Typically, guys with lots of previous time learn quicker, but it's no guarantee--it's attitude, do you want to become an AF pilot? Some guys with loads of time have washed out. I sent a Atlas B744 guy to UPT--he did fine, but not as good as the fuel truck driver in the unit who barely had 10 hours (all he could afford) who was the top stick in his class.
GF