since when is the torso 18" wide, and
6 ft tall? :-) The torso is but 12" wide of vital zone, and 24" tall, on a big man, frontally. 50% of the time, the man will be sideways, and skinny little Asians are a mere 8" wide. Most of the time, if you are prone, in the field, you won't be able to see...