Level IV (4) is the highest rating of personal body armor. Level IV will stop pistol rounds and rifle rounds, including a direct shot from a 30 caliber AP bullet. This bullet is the same size that is fired from a 30-06.What type of body armor does the military use?
Initially, military body armor was an M1 manganese steel alloy helmet and a vest made of ballistic Nylon that contained plates made from the same steel alloy the helmet was. The principle users were the US Army Air Force and the US Navy.