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Events
May
- May 28: Atriox is born.
August
- August 8: Dr. Catherine Halsey makes the first entry in her journal following her enlistment in ONI's service and arrival on Reach.[1]
- August 15: Thomas Lasky is born in Tricode Village, Mare Erythraeum on Mars.[2]
- August 22: Edward Buck is born in New Albany, Lombard, on Draco III.
September
- September 3: Michael Sullivan is born on Emerald Cove.[3]
December
- December 1: The UNSC Pillar of Autumn is commissioned into service.[4]
- December 15: Carris-137 is born in Irbid, Tribute in the Epsilon Eridani System.[1]
Unknown
- Between 2510 and 2511, the future candidates for the SPARTAN-II program are born.[5]
- The Mark III exoskeleton is introduced. It is retired the following year, with the Office of Naval Intelligence's Materials Group pursuing Project: MJOLNIR instead.[6]
- The structural system of the Halcyon-class light cruiser is designed by Dr. Robert McLees.[7]