got a helmet that would have cost me 180 vanguard marks essentially, and a new plate that I equipped just because I liked the way it looked with the Queen symbol better.

Plus the missions weren't bad at all. They're just story missions, so the best strategy is to just save up all your rocket ammo for whatever the final boss is, then immediately on that boss spawn unload the rockets. I completed four Kill Orders last night and multiple times we killed the boss before even a single add spawned in. Too bad I'm not getting Queen rank, I would like one of her marks, but the purple armor I got is pretty dope and should push me to 27 if I level it all...