2511

2511 was a year in the 2510s in the 26th century.

January
January 3
 * All data pertaining to the planet Onyx is deemed classified.

February
February 15 February 23
 * Dr. Catherine Halsey delineates the fundamentals of the SPARTAN-II program, specifically her refinements in relation to the ORION Project.
 * Dr. Halsey learns of a terrorist with the Freedom and Liberation Party that detonated a commercial nuclear explosive in the Haven arcology, and proceeds to log this in her journal.

March
March 5 March 7 March 19
 * Jorge-052 is born in Pálháza on Reach.
 * John-117 is born in Elysium City on Eridanus II.
 * Linda-058 is born on Verent.

April
April 3 April 21
 * Frederic-104 is born on Ballast.
 * Douglas-042 is born on Asphodel.

May
May 4 May 8 May 16
 * Petra Janecek is born in Serif on Lenapi.
 * Jerome-092 is born on Minister.
 * Caleb-095 is born in Newport on Luyten.

July
July 10 July 17 July 30
 * Samuel-034 is born on Harvest.
 * Alice-130 is born on Passage.
 * Dr. Catherine Halsey outlines the basis of the piezoelectric mechanical enhancement of what would become the MJOLNIR Powered Assault Armor.

August
August 21
 * A terrorist associated with the Freedom and Liberation Party detonates a nuclear weapon at the Haven arcology on Mamore. The attack kills two million people and injures 8.3 million others.

September
September 8 September 15
 * Dr. Halsey writes down her thoughts regarding the recent breakthroughs on human neural cloning in relation to the flash cloning of the SPARTAN-II candidates. She informs Vice Admiral Michael Stanforth that the project will proceed to the candidate procurement stage.
 * Naomi-010 is born on Sansar.

October
October 19 October 22
 * Kurt-051 is born in Mira on Circumstance.
 * A report is made on Forerunner artifacts that are found during routine excavations in an area designated Zone 67.

Unknown

 * Most of the future SPARTAN-IIs are born in this year.
 * Randall-037 is born in Hull, England, on Earth.
 * Jack Pilvros Hannibal tests the first small-scale quantum photonic amplifier on SATCOM relays, revolutionizing the speed and integrity of extraplanetary communications.