Khe Sanh, South Vietnam, an isolated United States Marine Corps out post during the Vietnam War became too dangerous to land due to hostile ground fire and shelling. To accommodate, C-130s used the Low Altitude Extraction System and kept the Marines resupplied with rations, fuel, ammunition and medical supplies. - Khe Sanh, South Vietnam, an isolated United States Marine Corps out post during the Vietnam War became too dangerous to land due to hostile ground fire and shelling. To accommodate, C-130s used the Low Altitude Extraction System and kept the Marines resupplied with rations, fuel, ammunition and medical supplies.