2500

2590 was a year in the 2500s in the 25th century. The year 2500 took place during the Covenant's 23rd Age of Doubt. It saw a major change in the UNSC's tactics used against the Insurrection, as Operation: KALEIDOSCOPE was launched this year. The Outer Colony, Meridian, was also retaken in 2500.

March

 * March 9: Preston Cole sends a communiqué to his wife, Inna Volkov, urging her to reconsider her recent filing for divorce.

May

 * May 28: Andrew Del Rio is born on Earth.

September

 * September 15: James Cutter was sent to the UNSC School of the North Star, on Earth, to study astro-navigation and political science.

Unknown date

 * The UNSC initiates Operation: KALEIDOSCOPE, a series of highly classified surgical strikes against prominent insurrectionist leaders.
 * The UNSC wrests control of Meridian from the Sundered Legion during the Siege of Athea.
 * Carlos Wambua is born.