The NFL is widely known as a very charitable organization. They have the Play 60 program to encourage children to spend 60 minutes a day doing physical activity, as well as making October Breast Cancer Awareness Month.
While the league as a whole may be considered charitable, it is the players who do the real work. There are the big-name players, like Peyton Manning and Drew Brees, who naturally have charities because they are just all-around great guys.
Then there are people like Warrick Dunn and Nnamdi Asomugha who do all of this work but don't draw as much attention to it.
Or Pat Tillman, who enlisted in the army after the attacks on September 11, and came to his untimely death with this decision.