Fireteam Mountain is a team of SPARTAN-IV supersoldiers of the Office of Naval Intelligence. Mountain, recognized under the team emblem of a simple white star, in armor colored black/yellow with a blue "recruit" visor, consists of four members when rescued by Crimson, and was assigned to the UNSC Infinity at some point before early 2558, having fought on the Forerunner planet Requiem.
- Fredric Zurenia
- Scott Macrae
- It can be assumed that Mountain originally consisted of five SPARTAN-IV's, similar to the majority of other squads.
- Although they are referred to as simply "Marines" in Spartan Mountain's episode description and by Sarah Palmer during the episode itself, their name and armor clearly indicate them as a SPARTAN-IV unit.