MRC:
An indication of the weapon/s/ for which the item is designed.AHVQ
Weapon For Which Designed:
Howitzer, cannon m2a1 and howitzer, cannon m2a2 and howitzer, cannon m4 and howitzer, cannon m4a1 and howitzer, cannon m49
MRC:
A feature of the item of supply which must be specifically recorded when the reference number covers a range of items.ZZZY
Reference Number Differentiating Characteristics:
As differentiated by cartridge case material, fuze type, fuze model number, fuze delay time, propellant granulation type, supplementary charge, unit package quantity, unit package type, package model number, and dod ammunition code
