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• January: The Banished raided the UNSC's Carter Guard Armory, with Atriox personally killing a group of Orbital Drop Shock Troopers defending it with his bare hands. Helmet cam footage from Sergeant B. Wright, an ODST killed in the raid, provided the Office of Naval Intelligence with its first look at Atriox, who was identified to agents by a captured Unggoy that had been forced to serve him.
• February 11: Dr. Catherine Halsey determines Cortana, to disable the viral termination code in her matrix, may be able to overcome the AI's 7-year life cycle.
• April 5: Miranda Keyes is awarded the Silver Star and promoted from Lieutenant to Lieutenant Commander in a ceremony in downtown Quezon on Reach.
• After July 9: Minab is glassed by the Covenant.
• November: By that month, 7 Covenant-held locations were raided by the Banished, with the most recent of which was a forward outpost meant to be attacked as part of Operation: SLOW DIVE.
• November 23: The Official Secrets Act is passed.
• The Halcyon-class UNSC Pillar of Autumn is refitted to serve near the Zeta Doradus system.
• Lieutenant Wagner suffers severe plasma burns to a third of his body.