The main purpose of this legislation, known as the "Old Glory Only Act," is to establish a rule that only the United States flag can be displayed at U.S. diplomatic and consular posts around the world. The goal is to maintain a uniform representation of the United States abroad and to prevent the display of any other flags at these locations. The key provision of this law is that it requires the Secretary of State to enforce a ban on flying any flag other than the United States flag at diplomatic and consular posts.