Interior Secretary Ryan Zinke has resurrected a military tradition at his department by requiring that a special flag be flown over its headquarters to mark whenever he is in the building, according to a report Thursday.

The blue banner, featuring the Interior's bison seal and seven white stars representing the department's bureaus, is hoisted by a security staffer when Zinke enters his downtown Washington offices before being pulled down when he leaves, per the Washington Post.

A spokeswoman for Zinke told the newspaper that the custom — not adopted by any other Trump Cabinet official — was "a major sign of transparency." Secretary of State Rex Tillerson also has a personal flag, but it flies atop of Foggy Bottom whether Tillerson is present or not.

"Ryan Zinke is proud and honored to lead the Department of the Interior, and is restoring honor and tradition to the department, whether it's flying the flag when he is in garrison or restoring traditional access to public lands," press secretary Heather Swift said in an email.

Zinke, a former Navy SEAL commander and Montana congressman, also commissioned personalized commemorative coins for staff and visitors, the Washington Post reported.

Zinke is currently being investigated by the agency's inspector general over questionable private air travel since becoming secretary.