- Covenant forces begin to swarm into the Inner colonies. For several years the war falls into a pattern: Humans win isolated battles, typically during ground operations, but at a horrible cost. In space, the Humans are losing at a precipitous rate, and one by one, the Inner colonies fall.
- With the introduction of the SPARTAN-III Program, the Cyclops exoskeleton is removed from service due to issues with its high power consumption and propulsion.
- Hayabusa Powered Assault Armor is developed by Facility RKD and accepted by the UNSC Ordnance Committee.
- Siege of the Atlas Moons: Danforth Whitcomb distinguishes himself in this engagement.
- Battle of New Constantinople: Spartan-III Alpha Company receives a commendation for bravery in this engagement.
- Battle of New Harmony: UNSC forces win a strategic victory over the Covenant at New Harmony by locating K7-49.
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