One Flag for All Act

This bill bans displaying any flag other than the U.S. flag on the exterior or in hallways of public buildings, including government offices, military installations, and embassies. Exceptions allow specific flags like POW/MIA memorials, visiting diplomats' national flags, a member of Congress's home state flag, military unit flags, tribal flags, or local jurisdiction flags. It directly affects how public buildings display flags, requiring exclusive use of the U.S. flag in designated areas. The bill applies to all public buildings under federal definition, with limited exceptions for historical, diplomatic, or local displays.