Rules for the national anthem differ across sports leagues - ESPN
Eagles, Washington Football Team hold moment of unity before Eagles return to locker room for anthem
Some fans boo show of solidarity to kick off NFL season
Former Spokane Indian Jordan Akin scores TD in NFL season opener, Morning Sprint
Texans remain in locker room for national anthem before game against Chiefs – The Denver Post
Houston Texans and Kansas City Chiefs begin NFL season with moment of unity, NFL News
NFL's moment of unity is greeted with boos in Kansas City
Chiefs rookie Edwards-Helaire shines in NFL debut vs Texans
Here's why the Texans say they decided to stay in the locker room for the national anthem
The NFL Responds to Donald Trump - The Ringer
Fans BOO as NFL stars unite against racism after Houston Texans leave field for anthem and Chiefs' Alex Okafor kneels