Mil-s-2656 mil spec 1st material response overall or mil-s-6049 mil spec 2nd material response overall or 66 fed std 3rd material response overall or mil-s-6050 mil spec 4th material response overall or mil-s-6098 mil spec 5th material response overall or mil-s-6757 mil spec 6th material response overall or ams 6300 assn std 6th material response overall