1. Bulletproof helmet is not realistic to expect it to be bulletproof (pistol bullets can block a block), bulletproof helmets are more useful for anti-shrapnel, the round shape can take care of the top of your head, your forehead, and the protective area is larger.
2. Bulletproof helmets belong to the mass production of protective gear in the military industry, and the convenience of stamping and molding of helmets should be considered in mass production, and the stamping of round helmets is obviously easier.
3. The round bulletproof helmet fits the soldier's head better (the Indian mountain troops have a square helmet), and it fits better with the human head, which can evenly reduce the impact force in the event of an accidental impact and protect the head as much as possible.
4. The round shape can bounce the bullet away to the maximum extent and protect the head when the bullet misses
