In the Field
Most of the confusion around body armor starts and ends with the NIJ rating. Officers ask us whether a Level IIIA plate will stop a rifle round (it will not). Administrators ask whether a Level III is enough for a patrol vest (it is usually overkill and too heavy). Armor selection is a threat-match problem, not a more-is-better problem, and the NIJ chart is the tool that keeps you from outfitting your team with the wrong thing at the wrong weight at the wrong cost.
Common Mistake
Assuming a higher NIJ level is always better rather than matching the rating to the threat.
Technical Detail
The National Institute of Justice publishes the authoritative ballistic resistance standard for personal body armor used in U.S. law enforcement. The current active standard is NIJ Standard 0101.06, with NIJ Standard 0101.07 rolling out as a replacement. Each rating represents a performance level tested against specified projectile types and velocities.
Current NIJ performance levels under 0101.06:
Level IIA. Tested against 9mm and .40 S&W handgun rounds at moderate velocities. Soft armor.
Level II. Tested against 9mm and .357 Magnum at higher velocities. Soft armor.
Level IIIA. Tested against .357 SIG and .44 Magnum. Soft armor. The highest soft-armor rating. Stops virtually all handgun threats.
Level III. Tested against 7.62x51mm NATO ball (M80). Hard armor plate required.
Level IV. Tested against .30-06 armor-piercing. Hard armor plate required.
Critical notes for selection: Level IIIA does not stop rifle rounds. Level III does not reliably stop armor-piercing rifle ammunition. Level III+ and special threat ratings are manufacturer designations, not NIJ certifications, and vary in actual performance.
NIJ 0101.07, currently being phased in, replaces the letter-based naming with simpler HG (handgun) and RF (rifle) prefixes and updates the ammunition used for testing to reflect current threats.
Always verify the specific NIJ certification listing for the exact model and lot being purchased. NIJ maintains a Compliant Products List that is the only authoritative source for what is and is not actually certified.
