Why are body armor vests?

During the cold weapon period, the soldiers who killed the enemy all wore armor, which can effectively reduce casualties. Since the gun was invented, the armor has been virtually useless under the power of the rifle. With the development of technology, after the birth of bulletproof vests and bulletproof helmets, the soldiers finally got effective protection. Bulletproof vests are also called bulletproof vests, and the area they can provide protection is extremely limited, only the area in front of them. So if the body armor can effectively bulletproof, why not protect all the arms and legs? If this is done, can the soldiers be effectively protected? However, the reality is cruel. If the body armor protects the limbs of the soldier, it will likely increase the casualty rate of the soldier. Modern body armor is still only at the initial stage. Whether it is a plug-in type or Kevlar, it is actually impossible to guarantee absolute safety. They are more often able to resist stray bullets or debris damage. If a soldier wears a bullet-proof vest and is faced by the enemy, he cannot guarantee his safety no matter how tightly he is protected. Of course, humans have the conditions to make bulletproof vests that can withstand any bullet damage. If a few centimeters of steel plate is used for protection, it is impossible for bullets to penetrate the bulletproof vest, but the soldiers of this bulletproof vest will definitely not be able to move. Too. Even the body armor that only partially protects against bullets will affect the soldiers ’movements. If these body armor are used to protect the limbs of the soldiers, the hands and feet of the soldiers may not be able to move normally. The bulletproof body armor will bring a great burden to the soldiers, and Kevlar's body armor will also restrict the soldiers' actions. Originally, body armor was used to prevent bullets and shell fragments. The things that caused the most casualties on the battlefield were artillery shells. Body armor and helmets actually played this role. Of course, there is also an important reason. The head and the human torso are the most important parts of the body. Once these two places are attacked, there are nine out of ten that will be fatal. The limbs are different. Even if you are shot, the probability of survival is still very high. Rather than wearing body armor that prevents you from moving, you can increase flexibility and increase your probability of survival through flexible tactical actions. The tactical movements of the soldiers are completed by the limbs. If the limbs are wrapped, it is difficult to complete the tactical movements. Even the soft body armor will slow down the movements of the soldiers. Put on more protective gear, because too hot will also cause a huge consumption of physical strength, especially on the legs, the impact is greater, you need to exert more force and sweat more. After the future technology continues to develop, body armor will definitely become more and more advanced. Perhaps the soldiers will fight like future soldiers, and then the kinetic energy rifle will be useless. Of course, unless the world is truly peaceful, otherwise there will be guns that can break the defense, and the spear and shield battle will never stop.