From Halopedia, the Halo wiki
2527 was a year in the 2520s in the 26th century.
- Jake Courage begins his career as a photo journalist on Reach.[Note 1]
- Michael Horrigan is born in Ganymede on Mars.
- Spartan John-117 fought alongside an unidentified Orbital Drop Shock Trooper on Green Hills.
These are events that are based around this year, and may not fall on this year specifically.
Around 4 years prior to December 27, 2532
Around 12 months after March 9, 2525
- SPARTAN Soren-066 is assigned to a supposedly temporary desk job on Reach. While stationed at this job, he meets Partch, an insurrectionist who eventually changes Soren's allegiance.
Around 10 years after September 2517
Around 7 years prior to 2535
- Halo: Landfall - Arms Race
- Halo Waypoint - Universe, Characters, Sarah Palmer (Retrieved on Nov 9, 2020) [local archive] [external archive]
- Halo 4: The Essential Visual Guide - Characters, Spartan Ops, page 18 (Commander Palmer)
- Halo Encyclopedia (2022 edition), page 100
- Halo Encyclopedia (2022 edition), page 103
- Halopedia - Jake Courage, Jake Courage (Retrieved on Oct 4, 2007) [local archive] [external archive]
- Halo Waypoint - Universe, Characters, Michael Horrigan (Retrieved on Jan 4, 2020) [local archive] [external archive]
- Halo 4, campaign level Shutdown: "Spartan-IV banter: 'I fought with you on Green Hills back in '27. I was just an ODST back then.'"
- Halo: Ghosts of Onyx, chapter 6
- Halo: Evolutions - Pariah
- Halo: Mortal Dictata, chapter 15
- Halo: The Cole Protocol, chapter 2