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Although the US military requirements for body armor mirror the NIJ's on a surface level, the two are very different systems. The two systems share a 44 mm (1.7 in) limit on back-face deformation, but SAPI-series plates increase linearly in protection (with each plate tested against the preceding plate's threats), and require a soft armor ...
For example, for NIJ Standard-0101.06 Level IIIA the .44 Magnum round is currently shot at 408 m/s (1,340 ft/s) for conditioned armor and at 436 m/s (1,430 ft/s) for new armor. For the NIJ Standard-0101.07, the velocity for both conditioned and new armor will be the same.
The 7.62×25mm Tokarev round is a relatively common threat in Russia and is known to be able to penetrate NIJ IIIA soft armor. [57] Armor protection in the face of the large numbers of these rounds, therefore, necessitates higher standards. [58] GOST armor standards are more stringent than those of the NIJ with regards to protection and blunt ...
The vest can withstand a direct impact from a 7.62 millimeter (both NATO and ex-Soviet types) on the front or rear if using the older SAPI plates (NIJ standard III). Use of the new E-SAPI plates increase protection to armor-piercing versions of the aforementioned rounds in addition to .30-06 Springfield M2
BA 9000 Body Armor Quality Management System Requirements were established by the National Institute of Justice as a quality standard for body armor.It specifies the construction and assembly requirements of personal armor for federal, state, tribal and local law enforcement and corrections agencies; the requirements of BA 9000 are voluntary (but it is recommended by the NIJ).
[1] [2] An ESAPI provides protection from .30-06 Springfield M2 armor-piercing (AP) with a steel [3] [4] penetrator in accordance with the NIJ Level IV standard, but costs about $600 per plate, 50% more than SAPI plates. [2] They are produced by Ceradyne, BAE Systems, and ArmorWorks Enterprises. [5]
Although they were not tested to be compliant with the NIJ standards, the Army's M1952a and M69 ballistic nylon Flak Jackets performed slightly better than NIJ level 1 body armor (a vest required 10 layers of Ballistic Nylon to meet the level 1 NIJ standard as seen in the Smith & Wesson's Barrier Vest), while the Marine's Doron plates inside ...
Body armor is always a compromise: mobility and comfort (and with it speed and stamina) are inevitably sacrificed to some degree when greater protection is achieved. This is a point of contention in the U.S. armed forces, with some favoring less armor in order to maintain mobility and others wanting as much protection as is practical.