DADT and it repeal applies specifically and exclusively to gay and lesbian members of the armed forces. Trans service members were, and are, excluded from any such protections. This is one of the bogeymen that the anti-gay lobby as used as a reason to leave DADT in place, the specter of a MTF in transition in the barracks.
In one respect, it is a great advance for LGB civil rights. Possibly a lynch pin for future civil rights changes for our community, certainly one of the most important. And I applaud it.
But, number one, the policy is still in place, and two, even after repeal, you are still at risk for discharge should your transition become known. So for goodness sake, you must remain closeted until you complete your deployment.
I don't know of any armed forces that allow any sort of cross gender expression or transition. It may ever be so.
I admit that transition while on duty would present some very difficult problems for active duty personnel. And, as we have seen, logical arguments would not be a factor in dealing with these issues.
From me, thank you for your service, and I am sorry that you must keep yourself so deeply hidden, yet still stand up and risk all for us. It is heartbreaking.
-Sandy