2523

2523 was a year in the 2520s in the 26th century.

March

 * March 11: Emile-A239 is born on Luxor, Eridanus II.

July

 * July 14: SPARTAN-IIs train on Reach, where they successfully capture a Marine base flag.

Unknown
Around eighteen months prior to December 21, 2524
 * A rebellion breaks out on Andesia due to many citizens becoming extremely resentful of the Unified Earth Government and the planet's mega-corporate council that serves as Andesia's de facto planetary government.
 * April Orenski joins the Corbulo Academy of Military Science.
 * At some point in the middle of the year, courtesy of increasing Insurrection activity, Jilian al-Cygni's workload begins to increase.