Actually, it is. I know several guys doing this, all ranging from 13-16 years when they got out of AD, all O-4s (except for the passed over O-3s, who are now O-4s). Mostly in the Tanker and UPT world, but some fighter.

It's not just AGR you have to consider, but also AT, ST, and MPA. There's always too much flying/not enough bodies, nobody who wants to go on the 2-week trip, more students than IPs, and that Pentagon/MAJCOM tour (you can pretty much demand any staff job come with an API code these days) no one wants. You have to be willing to possibly change airframes or move to DC or your nearest UPT base, but it is the Guard/Res, it is way better than AD, and you can easily get an AD retirement and a seniority number by "quitting" (the AF is jealous of us quitters!) at 16 years.

Again TRS is money.