The fact that the military spends 10x the amount of money on Viagra as it dose gender reassignment surgery knocks that argument down. So the question is only about troop readiness. Considering that trans people have been serving in the military and we always say our military is the best, what evidence is there that it lowers it? And perhaps most importantly, how is this not the same argument made against letting gays, women, and lacks serve in the military? Anyone willing to risk their life to protect mine is A-OK in my book. Whats next, trans people cannot be firepeople  policepeople, EMT, lifeguards,  etc because all those professions involve trusting your coworkers with your life?