2540


 * Lieutenant Commander Fhajad-084 wrote the UNSC Astrophysics Journal 034-23-01 on May 097 (Military Calendar). This paper was used 12 years later in 2552 by at the time Commander Jacob Keyes when he realized Covenant warships were inbound for Sigma Octanus IV.
 * After his sixth birthday on July 5, Gabriel Thorne moves to the city of New Phoenix to live with his grandparents.
 * September 9: Taylor "Dutch" Miles enlists in the UNSC Marine Corps.