What is the difference between 3A and HG2? whatvis hg2 armor? Are level 4 plates worth it? is 3A armor better than 3?The newest NIJ Standard 0101.07 for body armor is out. this is what it will mean for buyers. whether you are a police officer, security, military or an armed civilian body armor has grown exponentially in popularity. With this growth new ballistic threats have emerged that the National Institute of Justice has determined were not adequately covered by the old 0101.06 standard.