Broncos QB won't challenge NFL rulesDENVER -- Denver Broncos quarterback Jake Plummer must remove the No. 40 decal he's worn on the back of his helmet since training camp that honors former Arizona Cardinals teammate Pat Tillman.Tillman, the former safety who walked away from the NFL to join the U.S. Army Rangers and fight in Afghanistan, was killed in action in April.NFL spokesman Greg Aiello said Wednesday the league's long-standing policy prohibits personal messages on uniforms or helmets. Violators could...

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