The pictures are appalling, the words devastating. As a wounded Iraqi crawls from beneath a burning truck,an American helicopter pilot tells his commander that one of three men has survived his night air attack."Someone wounded,' the pilot cries. Then he received the reply: "Hit him, hit the truck and him.' Asthe helicopter's gun camera captures the scene on video, the pilot fires a 30mm gun at the wounded man,vaporising him in a second.