O'Neill describes his idyllic childhood in Butte, Montana; his impulsive decision to join the SEALs; the arduous evaluation and training process; and the even tougher gauntlet he had to run to join the SEALs' most elite unit. After officially becoming a SEAL, O'Neill would spend more than a decade in the most intense counterterror effort in US history. For extended periods, not a night passed without him and his small team recording multiple enemy kills-and though he was lucky enough to survive, several of the SEALs he'd trained with and fought beside never made it home.