When you talk about some of the greatest football coaches of all time, and not just NFL coaches or college coaches, but just football coaches, and the greatest minds in the sport, it's nearly impossible not to bring up Pete Carroll.

The 73-year-old Carroll clearly took the Raiders head coaching job because of the "one-in-a-lifetime" opportunity to work with the seven-time Super Bowl champion.

One of the biggest stories this offseason already has been the return of former Seattle Seahawks head coach to the NFL, Pete Carroll. Last week, Carroll was announced as the next head coach for the Las Vegas Raiders. The 73-year-old had been out of football for a year but now he is back and ready for perhaps his greatest challenge yet.