NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason - NFL.com

1. NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason  NFL.com
2. NFL owners vote in favor of letting players wear No. 0  ESPN
3. Calvin Ridley will wear No. 0 jersey for Jaguars  NBC Sports
4. Jaguars WR Calvin Ridley will wear newly allowed No. 0 jersey  Jaguars Wire
5. More Guardian Caps, And '0' On The Field  AZCardinals.com
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