Blue Six
From Halopedia, the Halo wiki
Blue six is the unit present at the very start of the Halo Wars Announcement Trailer, they were shown to be in an outfit of 4 M12 LRV Warthogs and two modified (turretless) Warthogs. The outfit is seen leaping over a rise in a snowy night landscape (the exact planet is unknown) and after that showing 2 marines from the outfit radioing in to the UNSC Spirit of Fire to confirm their joining with Blue 5 (which is another outfit consisting of 5 M808B Scorpion tanks). Both units are finally shown heading towards the last-known position of a recon force whom communications were severed. It is unknown what happens to Blue 6 and their fate after that scene.
Sources
- Halo Wars trailer.