The '21' is in honor of former Redskins safety Sean Taylor who was murdered in his house a few days ago.
Because Washington Redskins Safety Sean Taylor was shot and killed and his number was 21. So, every team in the NFL wears that on the back of their helmets.
San Diego does have the black 21 on their helmets.
McHale's Navy - 1962 All Chiefs and No Indians 3-21 is rated/received certificates of: Australia:G
April 21, 1993 ... Montana was traded to the Chiefs along with safety David Whitmore and a 1994 3rd round draft selection for the Chiefs #1 selection in the 1993 draft.
As of November 21, 2007 the Chiefs all time leader in rushing yardage is Priest Holmes with 6,070.
because they would get a concussion or worse
All NFL teams wore #21 on their helmets in Week 13 of 2007, to honor Sean Taylor, the Redskins star who was killed. Some, but not all, NFL teams continued wearing the number for the rest of the season.
Riders must wear helmets until they are age 21.
In select games for the 2009 season, the Chiefs-as well as the other founding teams of the American Football League-will wear "throwback" uniforms to celebrate the AFL's 50th anniversary and the 1962 Dallas Texans team that won the AFL Championship. the Chiefs were the AFC Dallas Texans before going to KC and becoming the Chiefs. The NFL is having having the teams wear their old jerseys to recognize the 50th anniversary of the AFC.When that franchise ( KC ) started play in the league as the Dallas Texans.
It was 30 but I just saw that he may have changed it to 21
the death of Sean Taylor on the redskins every team in the NFL has his number on them
Mountain bike helmets are better than dirt bike helmets