Cpl. Matthew Long, a motor transport mechanic, designed a tear-proof package filled with a cocktail of blood clotting and pain-killing agents that sits behind body armor, which would be released instantly if pierced by a bullet. Though Marine body armor, called "flak" jackets, come with small arms protective insert (SAPI) plates to stop bullets, they can have trouble stopping multiple rounds.

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Marine invents body armor that treats gunshot wounds