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January
January 17
 * By this date, the survivors of Henry Lamb Research Facility are reduced to eight.

January 23
 * On the, Spartan Sarah Palmer is interviewed by 92738-61842-LC about Cortana.

January 24
 * On the UNSC Infinity, 92738-61842-LC interviews Dr. Catherine Halsey about Cortana.

March
March 4 March 28 March 29 March 30
 * Orda Val 'Saham records his thoughts on one of the Ark's Cartographers and its link to the Covenant faith.
 * After 28 years of drifting in space the finds its way to the orbit of the Forerunner Installation 00, known as the Ark. Awakened from cryo-sleep, the crew eventually travels down to the Ark to find out how to establish contact with the galaxy. However, on the surface of the Ark they encounter a hostile, violent mercenary faction known as The Banished, led by the cunning Jiralhanae warlord Atriox.
 * Seth, an A.I. aboard the Spirit of Fire, cross-analyses transcripts, incident report data, and a past surveillance report provided by the Logistics Smart A.I. Isabel in order to compile a research report on Atriox for Captain James Cutter.
 * Ellen Anders learns more about the Forerunners thanks to Isabel, and wonders about the Librarian's plan for humanity, but she focuses her attention on helping the crew against the Banished.
 * Two Unggoy attempt to desert the Banished, but they are executed by Balkarus.
 * Decimus is killed by UNSC forces. Immediately after his death, the Spirit of Fire is attacked by the Enduring Conviction.

April
April 1 April 2
 * The Enduring Conviction is destroyed by Jerome-092 and Isabel when they forced the Ark's Aggressor Sentinels into attacking the ship. A Halo ring is discovered on the Ark's Foundry.
 * Ellen Anders and Installation 09 leave Installation 00 in hopes of getting to the Soell system, but are intercepted by a Guardian before they arrive.

May
May 1
 * Squad Sunray 1-1 manage to halt the Banished's plan of using a Forerunner to destroy the Spirit of Fire.

June
June 4
 * A Flood outbreak starts on Installation 00, and the Banished are forced to fight against them.

Unknown

 * A Sangheili shipmaster returns to the glassed human colony of Kholo. The species wide war between the Sangheili and the Jiralhanae is still ongoing.
 * Yapyap rebels against the Banished.