Trump merely reinstated a policy that had been in effect since we have had a military force.  The change that Obama made has not been placed into effect so in essence the decision be Trump changed nothing but merely reinforced existing regulations.  Any transgender that have or are serving in the military are guilty of a fraudulent enlistment and need to be given a General Discharge.  If they wish to serve the country ther are many ways open to them that are legal but the military is not one of them.