

The USCM have fought on more than two dozen worlds, including Tientsin (8 Eta Bootis A III), Helene 215, Linna 349 and the Alien planet itself, LV-426. The primary duty of the USCM is to maintain the security of the United Americas signatories and colonies, and serves as the vanguard of any major operation. Army, are part of the United Americas Allied Command.


There is also a reserve division and aerospace wing with an additional manpower of approximately 50,000 Marines. By the year 2179, the force has roughly 165,000 Marines divided into four divisions, four aerospace wings, and numerous support groups. The USCM is the United States' "force-in-readiness", who are at all times ready to operate in environments far from home soil.
