SUMMARY
Operation: WHISTLE STOP was a UNSC and ONI mission to recover a potential bio-weapon from a group of Sangheili and Kig-Yar pirates on the planet Ven-III in May 2558. The UNSC Infinity was sent to the planet to investigate the claims of a bio-weapon on the surface, and in the process was forced to destroy the encampments on the surface. Investigation after the fact determined that the threat of a bio-weapon was staged by ONI to force the Infinity to enter the region and wipe out the colony.
RELATED MEDIA
These events are depicted in the comic Halo: Escalation Volume 2, which was the subject of a Halo Book Club on April 2nd, 2016.