Do you want to serve your country in the military? If no, STOP. If yes, start the process as soon as possible, it can take a year or two. Some luck out, but assume it’ll be a year before you start UPT. .Yes, I believe there’s still a commitment of some term including seasoning back at your unit. Yes, you can change units, if life moves you elsewhere.
Successful completion will, very nearly, guarantee a legacy career, however. It will hugely influence your life—contacts, friends, introductions and eventual retirement. I regularly have lunch with friends from 40 years ago. I hosted a dinner for my first squadron commander last year, hale and hearty in his 80s.
Another friend used to say, 6 houses, 3 airlines, 2 wives, 1 Reserve unit.
GF