Regarding body armor:
1. Knives, arrows, and icepicks WILL defeat body armor, unless the armor is rated for stab/cut resistance.
2. ANY rifle round will usually defeat the most common types of body armor.
3. Body armor maintains its effectiveness because it is designed to resist or at least slow down projectiles with large frontal areas moving at relatively slow speeds. Increase the velocity, and/or decrease the frontal impact area, and you have problems.
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Hiding in plain sight...
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