Ballistics Specifications describe the attributes of a projectile which must be defeated by a particular material in order to comply with the various protection levels.

Ballistics Specifications do not specify a material.  Any material that can defeat the specified projectile will be rated according to that specification.  This is true if it is steel, composite, exotic or concrete.

Ballistics specifications are standardized in many countries and are used as reference when deciding on a protection level that will be required for a particular service requirement.  Once the protection level is determined, then materials used in the construction of the vehicle should all be compatible with that standard.
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