They have finally revised the MIL-PRF-63460 specification with an Amendment 7. That now makes two types of CLP available. Type I is for general environments whereas Type II is for extreme desert environments. The one thing that sets these two types apart is the weapons performance testing requirement. In addition to the 7.62 machine gun testing for Type I approvals, the Type II requires 5.56 machine gun testing after extended exposure to very fine dust. The only product now approved to meet the Type II requirements is the Break Free material.