O'Brien (Reach)

"Glad you could make it, Chief... we saved some party favors just for you."

- O'Brien greets John-117 on board the Pillar of Autumn

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

Battle of Reach
When Reach was attacked, O'Brien, along with Staff Sergeant Avery Johnson, PFC Wallace A. Jenkins, and Private Bisenti, were stationed above the planet. They were fighting a group of kig-yar boarders when MCPO John-117 and PO2s Linda-058 and James 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.

Battle of Installation 04
When the Pillar of Autumn was boarded in the opening stages of the Battle of Installation 04, O'Brien was wounded while helping fend off the invading Covenant. John-117 recognized him (but could not remember his name) and saved him from a Kig-yar soldier. He was killed at some later point during the engagement, either by other Covenant boarders or during another engagement of the Battle of Installation 04.

List of appearances

 * Halo: Combat Evolved
 * Halo: The Fall of Reach
 * Halo: The Flood