Defense Secretary Pete Hegseth has ordered that troops who need an exemption from shaving their facial hair for longer than a year should get kicked out of the service.

While commanders are still able to issue service members exemptions from shaving — a policy that has existed for decades — they will now have to come with a medical treatment plan, Hegseth said in an Aug. 20 memo made public Monday. Troops who still need treatment after a year will be separated from service, the memo says.

“The Department must remain vigilant in maintaining the grooming standards which underpin the warrior ethos,” Hegseth wrote in his memo.

The announcement applies to all the military services and is the latest in a series of restrictions after years of military services loosening the rules on how troops can look, often at the request of service members themselves.

Most shaving waivers are for troops diagnosed with pseudofolliculitis barbae, or PFB, a condition in which hair curls back into the skin after shaving and causes irritation. It is a condition that disproportionately affects Black men.