<Dl> <Dd> Armor Piercing Rifle </Dd> </Dl> <Dd> Armor Piercing Rifle </Dd> <Ul> <Li> 10.8 g (166 gr). 30 - 06 Springfield M2 armor - piercing (AP) bullets at a velocity of 878 m / s ± 9.1 m / s (2880 ft / s ± 30 ft / s). </Li> </Ul> <Li> 10.8 g (166 gr). 30 - 06 Springfield M2 armor - piercing (AP) bullets at a velocity of 878 m / s ± 9.1 m / s (2880 ft / s ± 30 ft / s). </Li>

When did the army start using body armor