International ballistic standards are created to reflect the most common types of ballistic threat present in the specific geographic region. For example, certain clients may only require light armored vehicles to protect against handguns and submachine guns (smaller caliber firearms), while others may require heavier armoring for their vehicle rated to defeat high powered rifle and machine gun ammunition.
The most commonly used standards are the CEN and NIJ Ballistic Standards:
European Normalization Standard (CEN) - Europe & Middle East
National Institution of Justice (NIJ) - North America