It's not up to them, I'm afraid. It is up to 'Mad-dog Mattis'.
"The Department of Defense declared Thursday there will be “no modifications to the current policy” on transgender service members for now, a day after President Trump issued a surprise three-tweet directive banning those troops from the military.
In a memo to service chiefs and commanders, Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford, Jr. declared no changes to the policy until "the President’s direction has been received by the Secretary of Defense and the Secretary has issued implementation guidance" -- which has not yet happened."
Defense Department to Trump on transgender ban: Not so fast
Sounds to me like Mattis was simply "getting in front of it"
perhaps this will clarify reality for you:
"There will be “no modifications” to the military’s transgender policy as a result of President Donald Trump’s declared ban on transgender men and women on Twitter, the chairman of the Joint Chiefs said in a message to top military officers on Thursday -- the latest sign of the disarray following the commander-in-chief's abrupt announcement.
Marine Gen. Joe Dunford also wrote in the message, which was sent to the chiefs of the military branches and senior enlisted leaders, that the military will continue to “treat all of our personnel with respect.”
Joint Chiefs: 'No modifications' to transgender policy from Trump tweet