Once again, thanks to a post a few dozen pages ago, I maintain this is the spartan version of a standard marine helmet, much like the ODST and MP variations. I believe this for 2 reasons.
One, note the shape of the helmet on the left in this picture. The curvature of the top, the dark circles around the ears. Picture those silver. It seems close enough of a match for me.
The second is the crazy monocle. It makes no sense whatsoever. Why have an external attachment? It looks so flimsy and in-effective. I know why. As a throw back to Halo CE marines, who had a similar device over the same eye. Not the best view, but you can make out the device in this picture.
So, I'd go out as saying the most likely identity of this helmet. The elements of the shape, the similar ear coverings, and the DBZ scouter over the right eye makes for a good guess as the identity of the new helmet: Marine Mojolir Variant.
[Edited on 02.21.2011 8:21 AM PST]