On "The Pillar Of Autumn", set the difficulty to normal and start at Rally Point Bravo. Once you take control over the big laser cannon, fight off all the Phantoms until a cinematic starts showing a Covenant Battle Cruiser exploding and The Pillar of Autumn starting to take off. Once the cinematic begins, hold the Right Analog-stick Right. When the Pelican is coming inside the ship, your camera will automatically move to the right and you will see the Master Chief in Cryo sleep, inside a Cryo Tube wearing his Mark V armor.