The sound of tire treads rolling over a smooth driveway was the only sound that could be heard on the street Col. John Boudreaux lived when he and his wife, Susi, pulled up to it. Susi shoved the gear shift to “Park.” She couldn’t do it fast enough, and sat back in the seat for a moment. She collected her thoughts as she closed her eyes and let her head fall back into the headrest. Her mind raced faster than her car could.