Support Units are a class of units with special abilities to support an army. These units have no traditional means of attack, but instead possess abilities to strengthen and maintain an army, and even damage or kill enemy units or buildings. They also can be killed by a Scout's Snipe or Sabotage ability, with the notable exception of Patriots, which are immune to sniping, and Spies, which can only be killed by the Counterintelligence ability or by a regular attack if revealed.

The following units are considered support units: