This specification covers quenched or quenched and tempered ultra-high-hardness (UHA) wrought steel armor plate for lightweight armor applications for ordered thicknesses from 0.118 inches (3 mm) up to an ordered thickness of 0.630 inches (16 mm), inclusive (see 6.1, 6.2, and 6.3). Although the major intent of UHA is an armor appliqué, UHA could be utilized as a welded structural plate if welded by special techniques.Intended Use: The steel armor covered by this specification is intended for lightweight applications where resistance to ball and armor piercing types of ammunition and multiple hit capabilities are required. Although the major intent of UHA is an armor appliqué, UHA could be utilized as a welded structural plate if welded by special techniques. Because of the high carbon equivalence (CE) of the type of steel specified, it will be more difficult to weld than MIL-DTL-46100E.