| Scout | Fast, cheap, sees far, often unarmed. Information, not damage. Build them early and keep building them. | Gnat (air) | Flea, Gnat (air) |
| Raider | Fast, cheap, hits hard, dies fast. Gets behind the line to kill constructors, converters and supply depots. Never in a head-on fight. | A.K. | Diamondback |
| Main battle tank / assault | The backbone. Durable, solid damage, moderate cost. Most of your army. | Storm → Bear → Goliath | Roach → Reaper → Mammoth |
| Skirmisher | Fire, reposition, fire again rather than standing still and trading. At Tier 1 the main battle tanks fill this role themselves. | Storm | Roach, Flashpoint |
| Skirmish support | Stacks disruption so the units around it can kill. Don't field it alone; don't judge it by kill count. | Equalizer | — |
| Artillery | Long range, slow, devastating, helpless up close. Must be screened. | Thud, Avalanche | Scorpion, Luger, Emperor Scorpion |
| Anti-air | Dedicated AA generally cannot shoot ground. Some artillery doubles as AA — the Scorpion engages ground, air and naval alike. | Crasher, Phalanx | Pulverizer, Scorpion |
| Air | Interceptors kill only aircraft. Strike fighters handle both. Bombers hit ground hard and need escort. | Sparrow, Hawk, Crow, Falcon (nuclear) | Wasp, Hornet, Bumblebee, Locust |
| Transport | Gunships that carry units, not transports that happen to have a gun. Put an army where it cannot be expected. | Condor, Eagle | Dragonfly (unarmed), Crane, Titan |
| Naval | A full parallel roster from Sea Factories in deep water. On a water map, sea control is economy control. | Piranha, Crusader, Conqueror, Colossus, Harbinger | Snake, Enforcer, Executioner, Warlord, Leviathan |
| Support | The units that don't shoot but decide fights. Fragile, and worth more than the units they protect. | Deleter (area cloak) | Protector (area shield) |
| Defence structures | Light anti-ground stops raider swarms. Anti-air ladders from cheap to long-reaching. Heavy turrets punish anything that holds still. | Menlo, Stinger, Immolator, Javelin, Guardian | Jericho, Razor, Inferno, Rattlesnake, Annihilator, Earthquake Mine |