MIL-A-12560 is a military specification that covers high-strength armor plate. The specification sets forth the requirements for ballistic-resistant steel plate intended for use in the construction of military combat vehicles.

The MIL-A-12560 is designed to provide protection against various ballistic and explosive threats. These plates are available in different classes designated as MIL-A-12560 Class 1, Class 2, and Class 3, which have varying levels of hardness, strength, and ballistic resistance. The specific grade required depends on the level of protection needed for a particular application. MIL-A-12560 steel plates are typically supplied in quenched and tempered condition to achieve the desired ballistic resistance and toughness necessary for each class.