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|  MIL-A-12560H (MR)
w/INT. AMENDMENT 4
contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within the
military service's system command. Packaging data retrieval is available from the managing
Military Department's or Defense Agency's automated packaging files, CD-ROM products, or
by contacting the responsible packaging activity.
5.1.1 Level C. DELETED.
5.2 Packing. DELETED.
5.2.1 Level C. DELETED.
5.3 Marking. DELETED.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is
not mandatory.)
6.1 Intended use. The armor specified herein is intended for use on combat vehicles and/or proof
and acceptance testing of armor defeating ammunition, but should also be applicable to armor for
emplacements, shields, pill boxes, testing, and the like.
6.1.1 Class 1. Class 1 wrought armor is intended for use in those areas where maximum
resistance to penetration by armor piercing types of ammunition is required.
6.1.2 Class 2. Class 2 wrought armor is intended for use in those areas where maximum
resistance to failure under conditions of high rates of shock loading is required and where
resistance to penetration by armor piercing ammunition is of secondary importance. It is intended
for use as protection against anti-tank land mines, hand grenades, bursting shells, and other blast-
producing weapons.
6.1.3 Class 3. Class 3 wrought armor is intended for use in the proof and acceptance testing of
armor defeating ammunition. This class is not intended for use in combat vehicles. Lift hole
requirements for class 3 armor should be specified by the procuring activity.
6.1.4 Class 4. Provision for this new class 4 type of armor plate is the result of an Army Research
Laboratory (ARL) Research & Development (R&D) Program. The information related to this
study was published in a Technical Report, ARL-TR-1347 dated April 1997, entitled Improved
Rolled Homogeneous Armor (IRHA) Steel Through Higher Hardness. Copies of this report are
published as ADA 329222 and are available from the Defense Technical Information Center
(DTIC), Suite 0944, 8725 John J. Kingman Road, Fort Belvoir, VA 22060-6218. The R&D study
illustrated enhanced ballistic performance with the use of increased hardness levels for
maintaining tougher and more ductile characteristics. This new classification was developed to
use in combat vehicles (3/4 inches to 6 inches) and tank construction. Class 4 material provides
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