Lt. Col. Tim Maxwell prided himself on being a hard-core Marine--a patriotic Devil Dog on his third tour of Iraq. Then his brain was shredded with mortar shrapnel. Today, Maxwell has a large angry scar on the left side of his head. He forgets words, his wife has to read to him, and he drags one foot when he walks. Yet he works twelve-hour days as commander of the Wounded Warrior Barracks at Camp Lejeune, North Carolina. For these warriors, Iraq and...