Spartan in Autumn

The Spartan in the Autumn is an easter egg found in Halo: Reach, on the campaign level "The Pillar of Autumn".

Description
An unknown Spartan is hidden in the same hangar that Keyes' Pelican docked in during the ending cutscene. Because most of the Autumn is a solid object that cannot be bypassed even with Pan cam, the player cannot see the figure properly, but the details are enough to make out a Spartan. The Spartan is white and is wearing full MJOLNIR Mark V armor.

Walkthrough
Activate Pan Cam during gameplay, and go to Theater to play the clip. Zoom in on the left side of the Autumn, near the second yellow crane (from the gameplay area's perspective). Try to pass through part of the hull. Once you've reached the solid barrier on the ship, find the last hangar to the left. The tiny Spartan can be seen in the hangar's right corner. After the cutscene where Emile is killed, the Spartan will disappear, likely due to the area being used during the cutscene.