As to yours...I am not a lawyer...but contrary to your worldview, the UCMJ was not created by a dictatorial president, but rather by CONGRESS...as all laws should be. Recently, however, it has been changed by a 'pen and a phone'...ie by executive order. I suppose anything is possible with an executive order, but that action of making law without congress is, IMHO, not in accordance with the constitution and is a practice that should be stopped.
However, I am positive that pre-Barry, cross-dressing was a violation of UCMJ, so any action to now make it illegal would be an undoing of his unconstitutional behavior and would be appropriate...but it will never happen.
Barry didn't feminize the military in one fell swoop on his first day of office. Instead, he waited for 'studies' and 'recommendations' - this is because Barry is not an idiot. For similar reasons, Trump can't undo Barry's work in an instant either.
If Barry removed cross dressing violations from the UCMJ then Trump can put it back in. What about the political ramifications of allowing this to go on? Trump looks really bad condoning this lunacy.