I’m speaking from an Army background myself, having taken training on how to recognize various combat injuries. I don’t know about the other services, but I assume they have similar programs.
I had an NCO who told me he had PTSD. He could not walk into a crowd without feeling very paranoid.
Wow! And what would you conclude about someone who, in a restaurant, always sits back to a wall with the entire room in view? Surely you understand that what libs call paranoid others call prudent. And just because you are paranoid doesn't mean nobody is trying to get you. Always check six, baby, it's the only way to go.