In 2525, the Pioneer was the staging ship from which the Spartan-IIs conducted an operation against the Eridanus Rebels to capture Colonel Robert Watts in the Eridanus System. It was also responsible for picking up the Spartans whenever necessary. 
- ↑ Halo: The Fall of Reach, page 139: What those critics forgot that a UNSC Destroyer sported 2 MAC guns, 26 oversized Archer missile pods and 3 nuclear warheads. Only seven meters longer than a frigate. No single ship fighters. Almost as heavy than 2 frigates combined mass.
- ↑ Halo: The Fall of Reach, page 75
- ↑ Halo: The Fall of Reach, pages 76-77