Elite helmet glitch

At the end of the level Floodgate (Level), when you go into the crashed Flood ship, you will find several dead Elites lying around. Some of them may have a weird cross-helmet that appears to be a blending of an assault helmet and a combat one.

It is unknown whether these helmets were meant to be included in the final game, either as an armor permutation or a single-player in-game model. They are only seen during this one level, and never on a living Elite.