PILOT-class Mjolnir

The MJOLNIR/Pilot is a UNSC Air Force helmet adapted for use with the MJOLNIR Powered Assault Armor as well as other UNSC armor systems. It entered service in the UNSC Air Force in 2541. It has an appearance similar to the EVA and SPI helmets.

It is an unlockable helmet in Halo: Reach and costs 90000 cR.

"Haunted" Helmet
The Haunted Helmet is a variant of the Pilot helmet. It is visorless and has a skull where the face should be. This helmet can be bought for 1 cR, but only after obtaining every other purchasable helmet.