Scanner helmet without the scanner. (Maybe with it flipped up on the brow plate, or removed entirely.) I saw the concept art of the Scanner helmet and the picture of it without the scanner looks really cool, a lot like Halo: Reach Commando. It would be quite easy, considering you already have 90% of the model, and would just need to add in how the visor looks like. Maybe throw it in with a map pack, as the season pass gives normal Scanner anyway.