The following Trojans have worn jersey number 3 (now retired):
Herschel Walker wore #34 during his NFL career.
Nile Kinnick, he was the 1939 Heisman Trophy too.
David Beckham wore the number 7 jersey before Ronaldo at Manchester United, Beckham wore the7 number jersey for England as well.
Because they beleive in God and every body knows Gods favorite number is 7
Curtis Martin wore jersey number '29', at the university of Pittsburgh.
Other than Dennis Riddle