ARTICLE 8. PERSONAL MESSAGES. Throughout the period on game-day that a player is visible to the stadium and television audience (including in pregame warm-ups, in the bench area, and during postgame interviews in the locker room or on the field), players are prohibited from wearing, displaying, or otherwise conveying personal messages either in writing or illustration, unless such message has been approved in advance by the League office. Items to celebrate anniversaries or memorable events, or to honor or commemorate individuals, such as helmet decals, and arm bands and jersey patches on players’ uniforms, are prohibited unless approved in advance by the League office. All such items approved by the League office, if any, must relate to team or League events or personages. The League will not grant permission for any club or player to wear, display, or otherwise convey messages, through helmet decals, arm bands, jersey patches, or other items affixed to game uniforms or equipment, which relate to political activities or causes, other non-football events, causes or campaigns, or charitable causes or campaigns. Further, any such approved items must be modest in size, tasteful, non-commercial, and non- controversial; must not be worn for more than one football season; and if approved for use by a specific team, must not be worn by players on other teams in the League.
The reference I posted in #1 is bogus but this one isnt.
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Rule 5, Section 4:
ARTICLE 8. PERSONAL MESSAGES. Throughout the period on game-day that a player is visible to the stadium and television audience...........
Page 23, 2017 OFFICIAL PLAYING RULES OF THE NATIONAL FOOTBALL LEAGUE
I hope the NFL goes down in flames for trying to place themselves and their hoodlums above the flag of the United States.