Well-developed bulletproof standards can not only correctly classify the protection grade of the bulletproof materials

but also offer efficient and practical guidance for commanders to choose different protective equipment when facing danger. Each country or an international organization establish their bulletproof standards according to their own particular circumstances

and therefore the protection levels vary from country to country. Several common bulletproof standards are summarized from four aspects: body armors

bulletproof helmets

armored vehicles and ballistic transparent materials. A side-by-side comparison of the projectile penetration energy for each protection level in different ballistic protection standards was conducted

and the bullet core and morphological structure of several of the commonly tested projectiles were compared and analyzed. Through the comparison and analysis of the commonly used bulletproof standards

the similarities and differences between domestic and foreign standards in terms of protection levels and the power of the tested projectiles were summarized. The results are expected to inspire and help researchers engaged in related industries to choose or improve their ballistic resistance standards.