ADVANCE FOR WEEKEND EDITIONS, JULY 4-6 - FILE - This is a June 2, 2014 file photo showing Houston Texans head coach Bill O'Brien heading to the practice field for NFL football training in Houston. Whether it is the calm demeanor of a Lovie Smith or Jim Caldwell, the cerebral approach of Bill O'Brien or the fiery passion of Mike Zimmer, the new NFL head coaches are stamping their personalities on their teams. (AP Photo/Pat Sullivan, File)