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The DUmmy is correct, Rebel. Compare the body armor used by police to the military issued SBA, which is made to orotect against rifle fire and fragments from explosions.
Threat level IIA Soft body armor, most commonly issued by departments, is made to defeat pistol ammunition. 5.56 will go through front and back of a threat level IIA vest. .30-06 will defeat any vest below threat level IV, or III with ceramic plates.