- Main article: Headquarters
The field headquarters is the primary production center of the United States Army. The field HQ can deploy survey teams and construction units, and also generates 30 every second. The Field Headquarters will be initially raised to Alert Status DEFCON 3 (ROUND HOUSE).
| Assault Breacher Vehicle|
Builder unit. Unit is automatically produced if a structure is placed for construction.
| Survey team|
Costs 1250. Light recon vehicle.
| DEFCON 3 structures|
Field headquarters, Refinery, LEM, Barracks, MG nest, Field generator, Light vehicle bay, Field hospital, Logistical center, Armory
| DEFCON 2 structures|
Power plant, FOB, Heavy vehicle bay, Helipad, Air control tower, Phalanx CIWS. Requires DEFCON 2 upgrade.
| DEFCON 1 structures|
Processing plant, Accumulator, MIM-104 Patriot, Peacekeeper missile silo, Administrative center. Requires DEFCON 1 upgrade.
| Long range survey team|
Costs 750. Affects survey team.
| Grizzly Project|
Costs 1000 and 500. Affects Assault Breacher Vehicle.
| Defense projection|
Costs 1000. Requires barracks. Affects MG nest.
| DEFCON 2|
Costs 2000 and 2000. Requires refinery. Unlocks all DEFCON 2 units, structures, and upgrades.
| DEFCON 1|
Costs 4000 and 4000. Requires DEFCON 2. Unlocks all DEFCON 1 units, structures, and upgrades.