There are different types of body armor with different levels of protection. For example flac vests do offer more protection to the sides, shoulders, neck and groind. And these were issued to infantry in early Vietnam war deployments. The problem with this type of vest is that in order to protect these areas they restrict the mobility of the wearer, which can be more deadly as they are unable to observe dangers and respond to them in a good way. For example body armor which makes it uncomfortable to fight kneeling down or laying down will cause the soldier to remain standing when fighting exposing their body even more. Thus the body armor increases the risk of harm rather then decreasing it. So even during the Vietnam war soldiers modified their flac vests to remove these restrictions. Opening up their collars and removing sholder protection.
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