American professional football player Forrest Gregg of the Green Bay Packers lets out a victory roar from the sidelines while covered in mud during a game against the San Francisco 49ers, Kezar Stadium, San Francisco, December 10, 1960. The Packers won 13 to 0. Gregg played for Green Bay from 1956 to 1970. (Photo by Robert Riger/Getty Images)
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