When sourcing body armor, the most vital factor is the NIJ (National Institute of Justice) Standard 0101.06. You must distinguish between Level IIA, II, and IIIA (Soft Armor), which protect against handgun rounds, and Level III and IV (Hard Armor Plates), which are designed to stop rifle rounds. Ensure the supplier provides authentic NIJ compliance certificates and not just 'tested to NIJ standards' claims. For international markets, check for ISO 9001:2015 and VPAM (European) or HOSDB (UK) certifications to ensure global quality consistency.