Armadillos and woodpeckers, while in basic training at North Fort Polk in the winter of 1969 & 70. I remember DI's getting really annoyed when us from the North watched the armadillos. DI's would redirect our attention to planes overhead, telling us that those planes were headed to Vietnam and 50% on-board weren't coming back. I was lucky I did basic training in winter, and after basic, was a deuce and a half driver. My cousin was at Ft Polk the summer before me. He was in advanced infantry. He still remembers being told, "don't pitch your tent near any holes in the ground", and guys being medivac'd out in the middle of night after being bit by something.