So you're implying that the reason transgender people join the military is because they want the government to pay for a sex change?  Really?  That is a big generalization.  The other fallacy you are pushing is the medical cost.  You are talking about a high of $8 million of a $825 BILLION budget.  That like a grain of sand on the beach.  I'll bet that is cost the military far more for medical treatment for alcoholics, drug abusers, or domestic violence.