2540

2540 was a year in the 2540s in the 26th century.

May
May 9
 * Lieutenant Commander Fhajad-084 published an article on slipspace physics that was featured within the later UNSC Astrophysics Journal 034-23-01. 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.

July
July 12
 * Operation: GUARDIAN LANCE takes place on Jericho VII, and results in several Covenant artefacts being captured by the UNSC for display inside SWORD Base.

September
September 9
 * Taylor "Dutch" Miles enlists in the UNSC Marine Corps.

Unknown

 * Around his sixth birthday on July 5, Gabriel Thorne moves to the city of New Phoenix to live with his grandparents.