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.

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 roughly 1,400,000 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 used by Bungie employees in much the same way as the Recon armor in Halo 3.