Brian Castner served three tours of duty in the Middle East, two of them as the commander of an Explosive Ordnance Disposal unit in Iraq. He and his team - his brothers - disarmed bombs. Sometimes they used robots and remote controls. Sometimes they set off controlled explosions. Sometimes one of the team would have to put on the eighty-pound Kevlar suit, take the Long Walk, and disarm the device by hand. Often they were simply too late; arriving just in time to pick up the pieces. In a hailstorm of bullets, bomb fragments, body parts and the endless wailing of innocent civilians, the days...