I don't know if I have much advice for you in regards to how to improve your application. That part will be difficult just because of being a gmo, continuing to work and then outprocessing from the military etc. There's certainly plenty of examples of people who have done gmo and gotten out to go into a number of different specialties on the civ side. I was deferred to a civ TRI as I first applied to EM in the mil match and didn't match. Then reapplied psych and got in. Some programs are better about taking into account this time period for you as a positive, being a more well rounded applicant, some experience of practicing autonomously and such and showing effort to get experience in whatever field you're interested in. You will be asked about why you wanted to go into psych as opposed to what you originally applied for but as long as you have sound reasoning to justify your interest in psychiatry that will be fine. The program I went to had some people who transferred from other residency programs or even one doc who was a pediatrician and practiced in the AF for a few years then came back to psych residency. Typically you'll come in as a PGY-2 since you have completed an intern year but they will alter your PGY-2 schedule to incorporate some of the rotations from psych intern year which typically is heavy on acute inpatient. PGY-2 typically is more consult service rotations at least that's how ours was setup. Then PGY-3 you'll do almost completely outpatient, then PGY-4 is glorious before getting out to full practice which is even better. Good luck to you going forward!