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2431 was a year in the 2430s in the 25th century.
- Meridian is founded.
- The M7S SMG enters service within the UNSC Armed Forces.
- ^ Halo Waypoint - Universe, Locations, Meridian (Retrieved on Jan 27, 2021) [local archive] [external archive]
- ^ The Rookie Cosplay Guide, p.60-64