PILOT-class Mjolnir

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

Two attachments are available for this helmet (not including Haunted). The first is an External Hardened Uplink Module (HUL[3]) attached to the right side of the helmet. The second is the Up-Armored attachment and an External Hardened Uplink Module (UA/HUL[3]) attachment, the HUL[3] also on the right side.

It is an unlockable helmet in Halo: Reach and costs 90,000 cR.

"Haunted" Helmet
"Happy friggin' Halloween!"

- In-game description

The Haunted Helmet is a variant of the Pilot helmet which has a transparent visor, showing a skull where the face should be. This helmet can be bought for 1 cR, but only after obtaining every other purchasable helmet base and sub-helmets. You need to have earned 1,526,000 cR to purchase every base and sub helmet. The player also needs to have the Inheritor rank to acquire the helmet. Because of the rank needed to buy this helmet, the Haunted helmet is currently exclusive to Bungie employees in much the same way the Recon armor in Halo 3 originally was. It can, however, be obtained by modding.

Trivia

 * If the Haunted Helmet is worn during the Noble Actual cutscene, one will see the base of a skull in their helmet as they put it on. If it is worn during the final cutscene of the Lone Wolf level, it will swap models with random helmets in between shots while it lays on the ground.