There was a battle going on in some place called Khe Sahn up in Quang Tri province right up by the Demilitarized Zone. NVA artillery was firing across the border and the US was responding with artillery and B-52 strikes. You could see the ground shake under the camera tripod that was ten miles away from the strikes. How could anybody live through something like that? The concussion of the bomb blasts could kill or wound people who were a hundred yards away.