Dr. Of Veterinary Medicine here. Most of my co-workers are very accepting of LGBTQ people. Owners not so much. Fortunately the state I now practice in has very good protections, even though I will likely never be able to socially transition. I know a large number of openly gay and lesbian veterinarians but I have never met another trans veterinarian, that I know of.
I was also in the Army. I enlisted at the age of 17, without needing my parents permission, being an emancipated minor. MOS was 11B. I was in deep cover/denial at the time.