What Do The NIJ Protection Levels Mean?
Body Armor Overview and NIJ Protection Levels - Spartan Armor
I think its great that the higher level armor is max level and
Level 4 Body Armor, Level IV Armor for Sale
Hard Rifle Plate Level IV ICW - Safe Life Defense
RTS Body Armor Rifle NIJ Level IV Active Shooter Kit Default Title
Body Armor Plate: Unleash Maximum Protection for Every Mission
Army to test a new, lighter body armor vest and full system this year
Advanced Concealed Body Armor: Stealth Carrier