From Halopedia, the Halo wiki
Freebooters perform the same role in the Banished as Kig-Yar Minors did in the Covenant, serving as basic infantry, scouts, and guards. Typically, a Jiralhanae or Sangheili officer will lead a squad of Freebooters.
Weapons and equipment
Freebooter is another word for pirate.
List of appearances