You seem to have already forgotten the video I posted earlier that interviewed two Transgender military people. They were both transgender while they were still server, but had to hide it at work. That doesn't fall into your example of serving and then later in life (years later) becoming trans. These people literally went home at night and became their real selves, the side they had to hide while at work.
The woman transitioned while on active duty and deployed. The guy didn't physically transition (his reasons, to stay in military/keep benefits) but socially transitioned outside of work, wearing guy clothes, acting like a guy and using a guy's name in public. His co-workers/bosses likely knew he was trans because of that but left it alone. I don't really call any of that hiding. You were wrong about your examples especially with the woman. *shrugs.
While I do agree that there's plenty who wanted to transition but hide it completely til they were out, there's likely plenty who later figured out they wanted to transition after they were out of the military. My point still stands.
In the video, she says she was deployed in Afghanistan while on hormone therapy in the middle of her transition. She then says that word got out about her being transgender, command called her up, and Command asked her to retire. This certainly sounds like she was hiding her transgender identity at work somehow, even though she was going through hormone therapy. I don't know how, but if "word got out," then it doesn't sound like something she was declaring openly.
The guy says that he "hide in his true self" while at work and was miserable. It doesn't sound like he was likely out at work, as you think.
These two examples hold that there have been transgender individuals in the military for years. I'm not sure why you have such a nitpicky stance on only identifying them as so at certain points later and not conceding they were transgender while serving as they are identifying themselves as such.
I don't think I'm going to reply to this anymore, because going back and forth with you is like arguing with a wall. You're very quick to nitpick small falacies in everyone else's arguments, but you struggle to identify the same falacies in your own.