life: On the eve of the Super Bowl, LIFE pays tribute to that changeable male ideal: the American tough guy. (Photo: Bill Eppridge—Time &amp; Life Pictures/Getty Images)

life: On the eve of the Super Bowl, LIFE pays tribute to that changeable male ideal: the American tough guy. (Photo: Bill Eppridge—Time & Life Pictures/Getty Images)

life: On the eve of the Super Bowl, LIFE pays tribute to that changeable male ideal: