Not much is known about Team Gladius, other than that they were one of the three Spartan-III Gamma Company squads left on Onyx competing for top honors. They competed with teams Katana and Saber. When the Sentinels attacked Zone 67 and Camp Currahee, they were cut off from the others. They were declared KIA when their corpses were found with scorch marks on their armor suits, made by Sentinel Beams. Team Gladius had five members.
- It is also to be noted that "Gladius" is the Latin word for sword. The same goes with the other Gamma Company teams, "Katana" (Japanese) and "Saber" (European).
- Halo: Ghosts of Onyx (First appearance)