... ribbon, lining up / down Bator cortex.· Executive standard: NIJ Standard 0101.04 U.S. National Institute of Justice, "bullet-proof ... , bulletproof helmet, flat surface, no local uplift, folds and other defects; helmet grain polished table, non-reflective, anti ... of ergonomic principles, based on user tasks, strength and characteristics of series ballistic protective helmets used Yongtai military ...