In 2544, shortly after the Battle of Miridem, he received a narrow-band point-to-point transmission from VADM Berlin M. Tursk regarding the capture of Catherine Halsey. Soon after, he was involved in a mission with a group of SPARTAN-IIs to retrieve Halsey from a Covenant fleet at some point before the Fall of Reach. He monitored the Spartans' mission from the bridge of the stealth ship. He then evacuated the remaining Spartans along with Catherine Halsey.
- Though Jiron's rank is Captain, his rank insignia is that of a Commander.