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When I got to Ft Stewart GA in the early 90’s, we had two new recruits who had just returned from CIF (central issue facility) and received their TA-50 (Army issued equipment for you non Army folks). They began arguing over their flack vest being bullet proof. Not having a weapon and ammo, they decided that if it could stop a knife it would stop a bullet. One donned his freshly issued flack vest and the other proceeded to jab a Kbar into his heart killing him almost instantly.
The next morning we had a safety briefing by the 1st Sergeant who explained to the entire company that a Flack vest will not stop bullets or knives, it was designed to protect against fragments from artillery and grenades.