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So how are teams assigned?

Each of the Regional Command Bases have the following either assigned directly to the base, or to support regional operations:
Command Team
Communications Team
Operations Team
Logistics & Support Team
Aviation Team
Power Generation Team
MARS Team (Base Security)
MARS Team (HAAM)
Recon Team
Recon Team
Recon Team
Recon Team
2-4 Engineering Teams
Frozen Watch Team

Because these teams are intended to operate throughout the region, they trend towards the larger size (18-30 personnel).

Each state on the region would have the following:
Command Team
Communications Team
Health/Medical Team
Science Team
1-3 MARS Team
1-8 Recon Teams
1-3 Engineering Teams
Frozen Watch Team
0-2 Decontamination Teams
Team sizes range from as few as six to as many as eighteen. For those states that do not encompass a large area (most of the New England states for example). They would have a command team and 1-2 recon teams assigned OR would fall under a Combined Team that would cover 2-3 of the smaller states.

The MARS Special Operations Teams range from 24-32 personnel in size and are supported by:

Command Team
Communications Team
Operations Team
Logistics & Support Team
Power Generation Team
Science Team
Aviation Team
MARS Team (Base Security)
Recon Team
Recon Team
Recon Team
These teams range from eight to fourteen personnel.

Combined Teams range widely in size and composition. These would be groupings intended to secure a critical Project asset (such as Desert Search/Starnaman Incident), dedicated towards a specific area (Final Watch), or with a specific objective (Lonestar).