Identify this helmet please?

This might already have been answered, but can anyone identify the helmet on the left?

http://www.halowaypoint.com/en-us/universe/detail/f1e347bc-83c2-48c6-894b-bd57f0120b0a/halo-4-crimson-map-pack-gallery#imageNumber=24

That’s the Strider helmet.

Strider is pretty baddass, although i dont use it.

The one on the left is Engineer helmet from the Specialization