Ground Attack Convoy Five "You have to pick your time to be nervous" AREA OF OPERATIONS RAKKASANS, IRAQ - The radio inside the humvee known as Hellfighter 5 crackled on. Lt. Col. Marty Herbert's voice came over the airwaves, his normal easy reassurance replaced with sternness. "OK," he said, "when we come to a halt I want 100 percent security." A moment later it was apparent why - division intelligence officers had received a warning that in the area a group of 10 to 20 Iraqi soldiers had broken up into two-man teams armed with rocket-propelled grenades. Ground Attack...