From Halopedia, the Halo wiki
- March 19: Catherine Halsey is born in Port Vernon on Endymion.
- March 21: Franklin Mendez is born on Sigma Octanus IV.
- June 7: Preston Cole appears before the Board of Inquiry at Luna OCS Academy to testify about a series of incidents involving the impregnation of Admiral Konrad Volkov's daughter Inna Volkov.
- June 9: Colonel Lima drops his charges of contempt and obstructing the tribunal's investigation against Cole, who is cleared of any wrongdoing.
- August 17: Preston Cole and Inna Volkov are married.
- August 21: The marriage certificate of Preston Cole and Inna Volkov is recorded.
- December 12: Inna Volkov gives birth to Ivan Troy Cole at 0445 hours. Knowing the child is not biologically his, Preston nevertheless accepts him as his son.
- December 16: The birth certificate of Ivan Troy Cole is registered.
- A very large rebellion occurs on the colony world Far Isle, with the UNSC unable to control it. A Code: Bandersnatch is thus declared, nuclear weapons being used to put down the rebellion.
- The Covenant stumbles upon Doisac, the Jiralhanae homeworld. The Jiralhanae were just beginning to recover after warring themselves back into a pre-industrial state during the First Immolation, and were quickly forced into submission by the Covenant's superior forces, making them the final species absorbed into the alliance.