Army, or law enforcement usually use the level IV ballsitc body armor. To reach this level, the vest need to add the hard ballistic plate into the plate carrier.
Ballistic Plate Level IV is the highest rifle armor plate rating under the NIJ STANDARD at present. A level IV must stop a single shot of 7.62MM AP “Black Tip”, which is effectively a .30-06 Armor Piercing bullet. Note the difference in shot count between a level III (6 shots) and level IV (1 shot) certification. Depending on the situation, level IV is therefore not automatically better than level III, despite the higher numerical ranking. The LEVELS of NIJ STANDARD as below.

Once you have decided the threat level that meets your requirements, you may also want to consider whether you need Stand-Alone or In-Conjunction With (ICW) plates. The vast majority of body armor is considered Stand-Alone, meaning it does not need a soft armor backer to meet its threat rating. In-Conjunction plates are designed to meet their rating only when worn over soft armor. Some plates may be listed as “Level III/IV ICW”, which means the plate is rated as a level III with a backer and level IV with a backer.
No matter what type of hard insert you might choose, it is always a good idea to wear a soft armor backer to help reduce blunt force trauma. While a plate might stop a bullet, it would be a mistake to assume that the wearer will be injury free afterwards. There is still a lot of energy being transferred into the plate and then into the wearer’s body. Plate backers can help mitigate some of this force, reducing the chance of severe injury. All HUASTA ballistic plate Level IV has pass though the shooting/pro test which according to NIJ STANDARD, it can really stop the bullet and save the solider’s life.

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