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The US Army advances through three tiers, starting at DEFCON 3 and proceeding to DEFCON 1. Each level unlocks additional research technologies and stronger units. Advancing to the next DEFCON level is done through the Headquarters building.
DEFCON 3 Structures
Field Headquarters
Refinery
Barracks
LEM
MG Nest
Field Generator
Light Vehicle Bay
Field Hospital
Logistical Center
Armoury
DEFCON 2 Structures
Power Plant
FOB
Heavy Vehicle Bay
Helipad
Air Control Center
Phalanx
DEFCON 1 Structures
Processing Center
Accumulator
Administrative Center
Patriot Defence System
Peacekeeper Missile Silo