I've actually been working on this piece for a couple weeks now. It was a difficult talk to make the front view of the "GRD" helmet accurate with the only couple of images of the actual helmet. I believe I came really close.
While making this, I noticed that it looked like the "eye" was an attachment. So I made a "standard" version of the helmet.
I used the EOD helmet as a reference (which was remarkably similar to this helmet.)