O'Brien (Reach)

''For the ODST sharpshooter, see O'Brien (Heian). For the ODST who participated in the Battle of Mombasa, see O'Brien (Mombasa).

Private O'Brien was a UNSC Marine who was stationed aboard Reach Station Gamma, Dock 9, during the Fall of Reach.

Fall of Reach
When Reach was attacked, O'Brien, along with Staff Sergeant Avery Johnson, PFC Wallace Jenkins, and Private Bisenti, were stationed above the planet. They were fighting a very large group of Kig-yar boarders with difficulty when MCPO John-117 and PO2s Linda-058 and James-005 boarded the station to destroy the logs of the ONI ship,. O'Brien and his Marine companions helped them accomplish this task, although James was lost and Linda was badly wounded. When they completed their mission, they were taken by a D77-TC Pelican dropship to the, escaping the ensuing destruction of Reach.

Trivia

 * While the subsequent whereabouts of Johnson, Bisenti, and Jenkins on Installation 04 are known, it is unclear what happened to O'Brien. In Halo: The Flood, the Master Chief briefly encounters an unnamed wounded marine on the Pillar of Autumn who he remembers rescuing from an orbital station above Reach. This may be O'Brien.

List of appearances

 * Halo: The Fall of Reach
 * Halo: Fall of Reach
 * Invasion