2556


 * February 7: Sedra City is attacked by a Sangheili terrorist.
 * November 6: The Shadow of Intent returns to active duty, accompanied by unidentified logistical support craft, to pacify rogue faction forces in the Urs system.


 * After November 7: Onboard the , Cortana, showing clear signs of rampancy, files a report on the history of the Forerunners and humanity.

Non-canon

 * September 25: Believe, a musical event performed by the UNSC Symphony Orchestra, takes place at the UNSC Symphony Hall at 1900 hours. It is centered on remembering Master Chief Petty Officer John-117 and his service to the UNSC.