RB Glen Bonner.Bonner wore #21 for the Chargers in 1974 and 1975.
ladainian tomlinson
Ladanian Tomlinson and his #21 Jersey should be retired IMHO. One of the best in Chargers history.
From what I've researched, no one wore number 21 for the San Diego Chargers in 1998.
21 on the San Diego Chargers
In 2009, the #21 jersey is worn by running back LaDainian Tomlinson (born June 23, 1979), drafted 5th overall from TCU in 2001 by the Atlanta Falcons and traded to the Chargers.
Chad Rinehart is number 78 on the San Diego Chargers.
Jeromey Clary is number 66 on the San Diego Chargers.
Malcom Floyd is number 80 on the San Diego Chargers.
Lawrence Guy is number 71 on the San Diego Chargers.
Jonas Mouton is number 57 on the San Diego Chargers.
Kenny Wiggins is number 72 on the San Diego Chargers.