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2541 was a year in the 2540s in the 26th century.
- Kojo "Romeo" Agu enlists in the UNSC Marine Corps, at the minimum age of 16.
- The Dumb AI Auntie Dot is activated.
- Vice Admiral Preston J. Cole records an entry in his personal log, describing the strain that the toll of fifteen years of hard fighting had placed on him.
- SPARTAN-III Beta Company undergoes one of a series of exercises intended to select candidates for further training. Using unconventional tactics, the Spartans of Team Foxtrot appropriate M202 XP machine guns along with weapons and armor from several waves of their instructors before being eventually ordered to stand down by Lieutenant Ambrose and CPO Mendez.
- The game Hyperforce is enjoyed by civilian children. 
- Rion Forge's grandfather dies of Boren's Syndrome.
- The UEG colony of Barugi is quarantined following a deadly outbreak of asteroidea merozoite three years prior. A series of thermonuclear Hornet mines are deployed around the planet to prevent the spread of the disease to other colonies. All UEG and UNSC vessels are instructed not to approach the planet.
- ^ Halo Encyclopedia (2022 edition), page 109
- ^ Halo: Evolutions - Essential Tales of the Halo Universe, The Impossible Life and the Possible Death of Preston J. Cole pages 320-322 (2010 edition, Vol. I)
- ^ Halo: Ghosts of Onyx, Chapter 9
- ^ Axon Clips Chapter 6
- ^ Halo: Smoke and Shadow, page ??