As an 0311(any 03xx for that matter) in the Marines, we are taught two to the chest. As a shooting coach in the marines, I teach two to the chest. I can assure you this is practiced in combat too. He's wrong in saying its out, but the pelvic region is a very good target, especially when the target fails to stop..but so is the head. Im sure our failure to stop drills are no different then everyone elses, 2 to the chest and 1 to the head/pelvic region.