Each player starts with two factories, one of which specializes in air combat units and the other in ground warfare units; on each turn, the player can, if he still has a factory that has not been destroyed, produce one military unit.
Each player starts with two or three factories, at least one of which specializes in air combat units and at least one of which specializes in ground warfare units. On each turn, the player can, if he still has a factory that has not been destroyed, produce one military unit.