I did Basic Training at Fort Polk, LA, in 1971 and those silhouette target dimensions appear to be the same as the "fall down" silhouette targets on the ranges back then. We were instructed to shoot at the top of the head at 500 meters to allow for the .223-cal. bullet drop at that distance. I also loved shooting long distance best.
I qualified "expert" with the M-16 and would have with the M-14 except I intentionally missed a couple of long-range targets so I could also wear the "sharpshooter" badge on my uniform.
Oh yeah, we also had feral pigs running around the far ends of the ranges...and were told to always check the shooting pits for snakes before climbing down in them.
We had four kinds of snakes at Fort Polk: rattlesnakes, copperheads, cottonmouths and coral snakes. Each one just a bit deadlier than the last. Luckily for me the only one I ever saw was what looked to be about a 6-foot rattlesnake in a pic on the front page of the post newspaper the first day I arrived. The soldier that killed it was holding it out at arms length and the tail was dragging on the ground.
