Story highlights Trump announced on Wednesday that transgender individuals would no longer be allowed to enlist or serve in the military

US defense officials have indicated that they were caught off guard by the policy change

Washington (CNN) The Joint Chiefs of Staff, including chairman General Joseph Dunford, were not aware President Donald Trump planned to tweet a ban on transgender service members, three US defense officials told CNN -- the latest indication that top military leaders across all four service branches were blindsided by the President's announcement.

For now, Dunford has informed service members that there will be "no modifications to the current policy until the President's direction has been received by the Secretary of Defense and the Secretary has issued implementation guidelines."

"In the meantime, we will continue to treat all of our personnel with respect," Dunford wrote in a memo to the military that was obtained by CNN. "As importantly, given the current fight and the challenges we face, we will all remain focused on accomplishing our assigned missions."

Army Chief of Staff Gen. Mark Milley said Thursday that, to date, he has not received "directives on implementation" for a ban and learned about the President's decision through the media.

"We will work through the implementation guidance when we get it and then we'll move from there," he added while speaking at the National Press Club.

Read More