FILE - This Aug. 17, 1996, file photo shows Dallas Cowboys running back Emmitt Smith taking the hand-off from quarterback Troy Aikman during an NFL football  game against the Denver Broncos,  in Irving, Texas.  Smith's desire, drive and durability turned him into the most productive running back in NFL history. (AP Photo/Tim Sharp, File)

Photo by: TIM SHARP

FILE - This Aug. 17, 1996, file photo shows Dallas Cowboys running back Emmitt Smith taking the hand-off from quarterback Troy Aikman during an NFL football game against the Denver Broncos, in Irving, Texas. Smith's desire, drive and durability turned him into the most productive running back in NFL history. (AP Photo/Tim Sharp, File)