2554


 * Jul 'Mdama and his followers find the shield world Requiem. They attempt to gain entrance to the shield world but are unsuccessful until 2557.


 * Tedra Grant visits Earth for the first time.


 * December 15: Dr. Catherine Halsey, working on Ivanoff Station, files an audio log regarding the discovery of the Composer on the nearby Installation 03 and is fascinated by the similarities between the Forerunner device and the UNSC's AI matrix compiler.