- "The pack shall feast on you!"
- — Brute Chieftain to Master Chief
A Pack is a term used to describe a small group of infantry led by Jiralhanae pack leaders, usually Captains or Captain Majors. Each member of a pack is hand-picked by its leader, and is roughly equivalent to a Sangheili Lance. Packs are organized under Master-Packs.
Prior to the Great Schism, Covenant infantry were grouped into Lances, each led by a Minor or Major Sangheili. After the Sangheili left the Covenant, and the Jiralhanae assumed their former places as part of the Covenant Loyalists; the Lance system was replaced with the Pack system, with Jiralhanae leading these units.
The lowest order of packs are comprised of four or five Unggoy, occasionally with two or three Kig-Yar added, normally led by Jiralhanae Minors and lower-ranked Captains in battle. A Grunt Heavy will sometimes be present to set up or man a Plasma Cannon or to operate a Shade Turret for heavy suppression.
Higher than that are all-Jiralhanae Packs, led almost exclusively by higher-ranked Captains. These are mostly comprised of Minors and lower-ranked Captains, and are usually considerably larger than a mixed-race pack.
At the highest echelons of the Jiralhanae pack structure are smaller Packs led by Chieftains. These are usually comprised of Bodyguards and/or Stalkers, and may include lesser races, such as Special Operations Grunts.