The number one role no matter what your MOS is, is to be a soldier. You are a war fighter and that is the basis of your basic training. If you join and never want to pick up a gun and defend your country or have the possibility of it ever happening, you should not join. No supply chain do not usually fight, but they may ned to be there to supply the front line. The Marines make every single Marine a rifleman first. They get additional training after that.

There is no place in the military for transgender people.

I for one would not have wanted one in my Mortar pit. They are a distraction and require special care. In the field everyone is green and equal. This is asking the services to make exceptions which makes you a shade of green which causes issues.