Still looking for the video, but I came across this in my twitter bookmarks, from a (female) US cop (now works in homocide/DV/sex abuse cases) who served in the US military:
"The main reason why trans people have no business in the military or in law enforcement is the prevalence of suicide attempts in gender dysphorics, but it’s not the only reason. Integrity is an essential part of both soldiering and police work.
Your buddies/colleagues have to be able to trust you with their lives, and no one who is willing to lie about such a basic and obvious fact as their own gender deserves that kind of trust.
It’s way more important for cops and soldiers to go home in one piece the end of the day than it is to pander to and placate a group of people who all seem to have the worst case of main character syndrome the world has ever seen."