Word is that the Legion's old timers have shown up, Caesar's veterans from the Red Okie Centuria and what was the Painted Rock tribe. They're the best of the best and the baddest of the bad. Short of a centurion or a praetorian, they don't come any tougher.”— Chief Hanlon, Fallout: New Vegas
The Painted Rock were a tribe from what was formerly the American Southwest.
Little is known of the Painted Rock tribe other than the fact that several of the Legion's veteran soldiers were once members.
The Painted Rock are mentioned in Fallout: New Vegas.