Winston Groom said this quote

After a while, they start landing some relief in helicopters, and I guess the napalm bomb have frightened away the gooks. They must of figured that if we was willing to do that to ourselves, then what the hell would we of done to them? They taking the wounded out of there, when along come Sergeant Kranz, hair all singed off, clothes burnt up, looking like he just got shot out of a cannon.