In a memo, the Pentagon said the U.S. will begin removing transgender troops from the military within 30 days unless they obtain a waiver on a case-by-case basis.

The Pentagon plans to kick out currently serving transgender service members who don’t meet specific requirements under its new policy, according to official guidance made public in a Wednesday court filing.

The previous Trump administration effectively banned transgender people from joining, but the new memo says currently serving transgender troops will be discharged.