That raises a good question: If gunshot wounds are equally lethal all across the body, why are military personnel instructed to aim for the chest or head? Or is that another myth?
I didn’t say that all gunshot wounds are equally lethal. My point was that all gunshot wounds have the potential to be life threatening. A bullet to the heart and a bullet to the pinky have very different odds ratios of killing the victim, but either can be deadly.
Military personnel are aimed to shoot for the chest because it’s the largest area to aim for, easiest to hit, slowest to move, and has the highest likelihood (outside the head) of disabling or killing your opponent. Police are trained this way, military are trained this way, and they do so because it works.
Headshots are very difficult to pull off, because the head can move and is much smaller than the chest. However, they are almost universally either lethal or permanently disabling.
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