Bok

Bok was a Covenant Jackal stationed aboard the Pillar of Autumn crash site during the events on Installation 04. After a raid by the ODSTs led by First Lieutenant Melissa McKay, he was assigned to inspect and haul cargo coming into the crashed vessel for use by the Covenant who occupied it. This was to make sure that Flood did not infiltrate the vessel.

He was placed under the command of Yayap after the Grunt arrived at the site following a failed battle at Alpha Base. He did not like the Grunt, calling him a "Gas Sucker." Nevertheless, he complied with Yayap's orders because he had no choice. He, along with Jak and Yeg tried to make Yayap's life difficult nonetheless.

One of the containers he opened contained a group of Infection Forms and Combat Forms. As he opened the container, they lept out and infected him, but the other Jackals and Yayap killed all the Flood and Bok before they could cause any harm.