From Halopedia, the Halo wiki
August 30, 2552
Flight Officer Mitchell was a Pelican pilot aboard the UNSC Pillar of Autumn in 2552. It is possible that he was from the 23rd Naval Air Squadron being part of Echo 419's wing.
Mitchell was sent to fly the SPARTAN-II Red Team, headed by Spartan Frederic-104, down to the surface of Reach during the Battle of Reach aboard Pelican Bravo 001. He was killed when a Covenant AA plasma mortar hit the Pelican, destroying its cockpit with him inside, despite Knife 26's attempts to protect the dropship.