Antifa is a greater percentage of the population than are mis-gendered people. If a person comes in after his gender assignment is complete, that is one thing, but it is an entirely different matter to expect the taxpayers to pay for a sex change to one different than the one you enlisted as. 

And if a person runs out of hormones on the battlefield, deal with it. It's your problem of your own making by you putting your health in the hands of the military combat resupply system that may have higher priorities at times than your emotional stability.