Ouch!

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Originally Posted by ddthetide

from the naval academy and that injury ended his career with the raiders and (i think) in the navy.

He did play for Navy (1986). Broke his leg (Badly) against 49ers I think in 1994. I know I'll never forget it.

From Wiki.

In the Raiders' opening game of the 1994 season, a September 5 date on Monday Night Football at the San Francisco 49ers, McCallum's career would be ended prematurely when 49ers linebacker Ken Norton Jr. twisted him to the ground. McCallum's cleat stuck in the ground, forcing his knee into a horrible dislocation. Norton lay pinned underneath a motionless McCallum for a couple of minutes while trainers attended to McCallum.

McCallum suffered a complete hyperextension of his left knee, almost to a right angle. He suffered a ruptured artery in his left knee, and tore three ligaments, tore the calf and hamstring from the bone, and suffered nerve damage in the knee.