It was SUPT until 5-6 ish years ago. I don’t know when Doss started but you did that before UPT if you didn’t have a PPL. That was referred to as IFS, and 2018/19? it changed from IFS (initial flight screening) to IFT (Initial Flight Training) from what I told it was the same but changed from a screening program to a “training” program.
2018/19 is when the SUPT most of us know started its change to the disaster we have now. I’m not super smart on the timeline, but I believe UPT next was a small and short program at Randolf/Austin, T-6 only, straight to a FTU. I think it only produced 20-40 grads.
2021 ish started the 2.0/2.5 and several other syllabus re writes.
22-24 The T-1 started sunsetting, and heavy folks started doing T-1 sim only programs. 2024 the T-1 sim only program sunset. They were not the regular T-1 sims, and while I’ve never been in one, from what I was told tbeh sucked.
2025 -IPT/FUPT. IPT is the training program at civilian schools to get studs a PPL/Inst/multi rating.
The “legacy” syllabus being referred to was similar to the 2.0/2.5 but had changes in when checkrides and how the mission phase was executed. (Honestly it might be the 2.5 syllabus, I can’t remember which was which, I started ram dumping that info when I left AD) it’s 20 ish more hours in the T-6 than FUPT. I believe the “legacy” syllabus is still being executed at several UPT bases.
To sum that up. legacy = Doss IFT (or PPL) + trans/nav-inst/form/mission in the T-6.
FUPT = civilian school, FAA grading standards, time building CFI instructors, FAA checkride PPL/inst Multi, and then 50 hours in the T-6 with no real dedicated nav/inst rides.
That being said the “legacy” being referred to is totally different than what most of us went though, and is really only a year or so old.