2551

2551 was a year in the 2550s in the 26th century.

Events

January 24

February 19

As part of Project CHRYSANTHEMUM, the SPARTAN-IIIs of Gamma Company begin their week-long augmentation process on the UNSC Hopeful in Sector K-009 folllowing its departure from Reach.^[2]^[3]

February 27

The Hopeful returns to Reach following the Spartans' augmentation procedures.^[4]

Before May, the CAS-class assault carrier Enduring Conviction, led by Let 'Volir, faces against the UNSC. During the battle, the Enduring Conviction performed impressive evasive maneuvers.^[5]

May 8

Dr. Catherine Halsey undergoes the Hemley & Aubourn Behavior Analysis; the results make ONI increasingly wary about her reported unreliability.^[6]

November 24

Mark V[B], the initial production model of the Mark V MJOLNIR armor,^[7] enters service.^[8]

December 5

December 6

At 0720, as part of Operation: GYPSUM UNSC forces, including Sergeant Sigrid Eklund and M9 Wolverines, clear out the Caravelle province on Concord.^[9]
Sigrid Eklund reports to Commander Renna regarding the events of Operation: GYPSUM indicating its success.^[9]
On Concord; Operation: SHARP ANGLE is noted as confirmed, and Operation: OFFSET EYE is noted as pending.^[9]

December 22

Pawel Czernek and John Tippett enter active service with the UNSC Marine Corps.
Concord is attacked by the Covenant; the colony survives largely intact. The Venator MJOLNIR [GEN1] variant gains prominence in the attack.^[11]^[12]
Gray Team is deployed on a mission against a Covenant facility within humanity's former territory.^[13]
The Battle of Meridian ends. Meridian is glassed and Chalybs Defense Solutions facilities on the moon are abandoned. The Covenant discovers a Luminary on Meridian that leads to Earth.^[14]
The UNSC Iroquois begins construction.^[15]
Veta Lopis' mother dies.^[16]
The M11 combat knife is manufactured by the Watershed Division.^[17]