From Halopedia, the Halo wiki
2528 was a year in the 2520s in the 26th century.
- Madrigal is invaded and glassed by the Covenant. Survivors flee to a set of asteroids in orbit above Hesiod, dubbing the worldlets the Rubble.
- Insurrectionist factions on Talitsa officially disband due to the escalation of the Human-Covenant War.
- The first SECURITY-class Mjolnir variant was manufactured by Misriah Armory on Mars.
- The Assembly Minority decides to sacrifice remote, low-population colonies in order to determine the Covenant's pattern of operation and plan effective countermeasures based on it.
- Katrina leaves her homeworld, Eridanus II.
- The United Nations Space Command classify the Taaku Xur-pattern Spirit, and the R'sisho-pattern Tick.
These are events that are based around this year, and may not fall on this year specifically.
Around 3 years prior to November 7, 2531
Around 3 years after Gage Yevgenny finished ODST training around 2525
- Halo Wars, Timeline Events: 30 January 2528
- Halo Encyclopedia (2022 edition), page 103
- Halo Wars: Limited Edition, Halo Wars: Genesis
- Twitter, Halo (@Halo): "#TodayInHalo 12/05/2528 - Edward Buck, legendary ODST Gunnery Sergeant and hero of New Mombasa, joins the UNSC." (Retrieved on Dec 5, 2013) [archive]
- Halo: The Cole Protocol, chapter 7
- Halo Encyclopedia (2009 edition) - Chapter Ten: Locations - UNSC Colonies, page 289 (2009 edition); 301 (2011 edition)
- Halo Legendary Crate - Data Drop #2
- Halo Waypoint - Universe, Locations, Talitsa (Retrieved on Feb 25, 2021) [local archive] [external archive]
- Halo: The Master Chief Collection: Halo 3, Spartan Armor Customization: Security - Description "The first SECURITY variant was manufactured in 2528."
- Halo 3, Spartan Armor Customization: Security - Helmet Description "The Mjolnir(m) variant was manufactured at the Misrah Armories Facility on Mars in 2528. It has been upgraded and modified to be compatible with all current-issue armor variants."
- Halo Encyclopedia (2009 edition) - Chapter Three: Spartans - Spartan Armor Variants, page 96 (2011 edition)
- Halo: Reach, Data pad 13
- Hunt the Truth - Season 1, Episode 02: BAD RECORDS
- Halo Encyclopedia (2009 edition) - Chapter Nine: Transport - Covenant Ships, page 282 (2011 edition)
- Halo Waypoint - Universe, Vehicles, Tick (Retrieved on Nov 11, 2020) [local archive] [external archive]
- Halo: Ghosts of Onyx, chapter 3
- Halo: Evolutions - Dirt