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The Dallas Cowboys, led by owner Jerry Jones, center, take a knee prior to the national anthem Monday night in Glendale, Ariz., ahead of the team's game against the Arizona Cardinals. Matt York/AP hide caption

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Matt York/AP

American gold medalist Tommie Smith (center) and bronze medalist John Carlos raise their fists in the air in a black power salute during the playing of the U.S. national anthem at the 1968 Olympics. Anonymous/AP hide caption

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Anonymous/AP

A $30 million partnership between the NFL and the National Institutes of Health is set to expire at the end of August, with much of the NFL's pledged money unspent. Above, NFL Commissioner Roger Goodell in February. Bob Levey/Getty Images hide caption

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Bob Levey/Getty Images

The New York Giants' Ereck Flowers (74) watches as wide receiver Odell Beckham (13) pretends to take photos of wide receiver Victor Cruz (80) dancing in the end zone. Michael Ainsworth/AP hide caption

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Michael Ainsworth/AP

Steelers owner Dan Rooney lofts the Vince Lombardi Trophy after Pittsburgh beat the Seattle Seahawks to win Super Bowl XL in 2006. Jeff Haynes/AFP/Getty Images hide caption

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Jeff Haynes/AFP/Getty Images

Stanford running back Christian McCaffrey said he will not play in the Sun Bowl on Dec. 30, so he can focus on preparing for the NFL draft. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

Minnesota Vikings players bring down Washington wide receiver Art Monk during an NFL game in 1992. Monk was one of the lead plaintiffs in the $1 billion settlement with the NFL over brain injuries among former players. Doug Mills/AP hide caption

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Doug Mills/AP