http://www.minddisorders.com/Py-Z/Transvestic-fetishism.html

"'The medical treatment of delusions, psychosis or emotional happiness is not surgery,' Dr. Berger stated."

https://www.lifesitenews.com/news/psychiatry-expert-scientifically-there-is-no-such-thing-as-transgender

"He explained that cosmetic surgery will not change the chromosomes of a human being in that it will not make a man become a woman, capable of menstruating, ovulating, and having children, nor will it make a woman into a man, capable of generating sperm that can unite with an egg or ovum from a woman and fertilize that egg to produce a human child."

I don't need a soldier w/ a potential for psychosis to disrupt an operation whereby other soldiers will be killed, maimed or harmed.  That would be dereliction of duty.