No such wording appears in the 2017 version of the Official Rules
of the National Football League.
Pages 62 and 63 contain only regulations about the enforcement of fouls
committed on the field during game play, and nowhere else does that document
specify anything about the either the playing of the national anthem
prior to games or the required behavior of players and team personnel
during that ceremony.
In fact, the rule book makes no mention of the national anthem at all.
“If you don’t know what you are talking about,
it is probably better to say nothing at all.”
Thanks for the information. I cut and pasted that from another website.
BTW How do I know what you’re writing is correct?
I posted something earlier from my FB page but I couldn’t source it. I asked the moderators to remove my posts and they didn’t. I did post an article from WaPo that had the anthem rule. But could;t find an NFL source for it.