This is clear as day. Not sure why there even is a discussion.
Being gay isn't a physical disability, it is a mental problem. Being transgender is a PHYSICAL problem.
If I lost my arm as a kid, why should the government allow you to get a job as a soldier? If I have poor eyesight, why should I be a fighter pilot? If I underwent hormone therapy and a sex change op, why should I get to command a nuclear submarine?