You can explain your argument to them, plead your case, but then you just have to let them decide. I’m sure if they’re 18+, they’re fully aware of how hard it is to be trans, no matter where they are in America. Being trans in the military though is still an opportunity for them, and not just for the military benefits. For a trans person, it’s an opportunity for them to potentially help in “normalizing” their lifestyle (making it more mainstream and accepted) and showing people that they can do anything that anybody else can do. It’s bound to be tough for them, but they’re showing alot of bravery putting themselves out there like that.