Blue Team is a combat sub-unit within the larger SPARTAN-II Division of the UNSC Naval Special Warfare Command, and is a semi-stable group consisting of four members. It has been led by John-117 for much of its combat activities during the Human-Covenant war, though after John's disappearance at New Mombasa the role of leader was taken up by Frederic-104. SPARTAN-III personnel were absorbed into the team during the Battle of Onyx.