In 2531 during the Battle of Arcadia, the Red Team split up into two teams, with a three-Spartan Red Team protecting Pirth City and Team Omega patrolling the rest of Arcadia. This group re-joined Red Team leader Jerome-092, Alice-130 and Douglas-042 on a final attempt to regain control of the Arcadian city.
- Five members of Team Omega appear at the end of the Halo Wars Announcement Trailer, armed with Battle Rifles and wearing dark-gray armor bearing similarity to the MJOLNIR Mark VI, an old rendition of the SPARTANs in Halo Wars.
- Team Omega is only controllable in the Arcadia Outskirts, which is a large stretch from the original thought that the team was going to be constant.
- All six members have reused voices of Jerome, Alice, and Douglas.
- Halo Wars (First appearance)