2553

2553 was a year in the Military Calendar.

Background

2553 was one of the bloodiest years in the Human-Covenant War, as well as the last .

At the beginning of the year, Covenant Loyalist forces assaulted the Human city of Cleveland, Ohio in the United States on Earth. The Loyalists were looking for the Key of Osanalan, a mysterious Forerunner device related to the Halo Installations.

During the Second Battle of Earth, a battle at Pawas in Afghanistan took place. There, UNSC Marine Corps forces battled Loyalist forces for control of a Satellite installation. Numerous Marines of the 2nd ODST Battalion targeted the Forerunner Dreadnought entering Earth's atmosphere. Onboard was one of the last SPARTAN-II Commandos, Master Chief Petty Officer John-117.

Notable Deaths

United Nations Space Command

• Commander Miranda Keyes
• Sergeant Major Avery Johnson

Covenant Loyalists

• High Prophet of Truth

Forerunners

• 343 Guilty Spark

Flood

• Gravemind

Battles

• Battle of Mare Erythraeum
• Second Battle of Earth
  • Battle of Cleveland
  • Battle of Pawas
  • Battle of the Crow's Nest
  • Battle of Voi
  • Second Battle of Mombasa
• Battle of Installation 00
• Second Battle of High Charity