3 Echo was a UNSC Army unit stationed on Reach during 2552. During the Covenant assault on ONI's Sword Base, a team led by 3 Echo 57 was engaged by two Type-26 Wraiths and tried to retreat back into the base in a M831 Warthog. However, they were killed by one of the Wraiths.
List of appearances
- Halo: Reach (First appearance)