Flag etiquette mistake: You carry the flag horizontally ... to the right of the flag of the United States of America." ...

The U.S. State Department reportedly adopted a new policy under the Trump administration that blocks U.S. embassies and outposts from flying Pride and Black Lives Matter flags.

It might come as a surprise, but U.S. service members weren't technically allowed to unfurl giant U.S. flags at major events, despite the practice's status as a staple of many pregame ceremonies.