In 2543, Admiral Preston Cole was in command of the sector. During the year, at least two engagements took place there; the Battle of 18 Scorpii on March 6 and the Battle of Psi Serpentis on April 18. In 2552, it was commanded by Admiral Michael Stanforth. During this year, the Battle of Sigma Octanus IV took place in this sector.
- Halo: The Fall of Reach (First appearance)
- Halo: Evolutions - Essential Tales of the Halo Universe