Did you know that is the original PREDATOR helmet? They were going to use that helmet instead of the one they used, but S.W. thought it resembled what the PREDATOR looked like, so they changed it, as to not give away the "creatures" likeness.
...just a little factoid, incase you didnt know. I like that they used it in P2, and the ELDER from P2 was actually the first PREDATOR mold, only with a little bit o' upgrades, and stuff.