Or go to vangaurd armory and buy the green helmets for 250 glimmer to dismantle. If you have plenty of glimmer that's one of the easiest ways or store armor engrams in vault and decode and dismantle on the class you need
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Or buy the green armour, equip then do patrols etc. Break it down once its leveled out and you two or three mats rather than one. Or if u pick up a green engram oh on patrol/easy strike the equip and away u go. That's my current method. Still doesn't change the fact that I've got 440+ plating and short of the other 2