MRC:
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.MDCL
Material Specification:
417, grsc715abf2 military standard 1st material response or 417, grsc615abf2 military standard 1st material response or 417, grsc515abf2 military standard 1st material response or 417, grta710b3 military standard 2nd material response or 417, grta610b3 military standard 2nd material response or 417, gr510b3 military standard 2nd material response