The Spartan II program, led by Dr. Catherine Halsey, was a plan by the Office of Naval Intelligence to use children with superior genetic traits to create a group of super-soldiers in order to put an end to the ongoing Insurrection in the outer colonies. 

The Battle of the Rubble was a battle that took place in the 23 Librae system on a grouping of Lagrangian asteroids trailing Hesiod, a gas giant in the system, some time around 2535.

The Battle of Metisette occurred in the immediate aftermath of the Battle of the Rubble in 2535, taking place on Metisette, the nearby moon of the gas giant Hesiod.

Operation: SUNSPEAR was a mission to infiltrate Covenant space and destroy a major population center as an act of revenge for the Fall of Reach at the end of 2552.

The Carrow Conflict was a conflict between human, Sangheili, and Jiralhanae forces in the Joint Occupation Zone on the planet of Carrow in September 2558.