Teams in the National Football League retire jersey numbers of players who are considered by the team to have extraordinary talent and have made significant contributions to that team's success. As with other leagues, once a team retires a player's jersey number, it never issues the number to any other player, unless the player explicitly allows it.
With that information in mind, it shouldn't be too difficult to solve this puzzle.
N (Ronnie Lott) (Johnny Unitas).(Warren Moon + Ray Flaherty)(Donovan McNabb)(Steve Young)
W (Jim Kelly)(Joe Namath - Fran Tarkenton) (Ken Strong).(Charlie Krueger)(Raymond Berry - Jerry Rice)
Have fun and enjoy!
You can check your answers for this puzzle on GeoChecker.com.