2551


 * Pawel Czernek enters active service with the UNSC Marine Corps.
 * Concord is attacked by the Covenant Empire; the MJOLNIR (GEN2) Venator gained prominence in the attack.
 * February 20 - The Spartan-III's of Gamma Company undergo augmentations on the UNSC Hopeful.
 * May 8 - Dr. Halsey undergoes the Hemley & Aubourn Behavoir Analysis, the results cause several conclusions about her.
 * November 24 - The MJOLNIR Powered Assault Armor/Mark V enters service.
 * December 22 - The Car & Pilot Magazine releases its December 2551 Edition. This includes a review of the new 2553 edition of the Civilian "Hog".