In the FAA?
You get no benefit for your prior service. You will be paid about $9 an hour plus $79 a day per diem while at OKC. After OKC, you will take a pay cut at your assigned facility. Right now, academy grad pay is a little less than $32k a year before locality pay. If you go to a center, you'll sit at that for about a year (maybe more) before you see a raise.
The FAA blows right now. Stay military or try to get a DoD job, I swear, it's better. We are having a mass exodus of ex-military controllers leave the FAA for DoD jobs because 1.) They pay better 2.) they work less traffic, and 3.) They put up with infinitely less BS than the FAA is doling out right now.