Machine Gun - there are three generations of the
Machinegun, beginning with the unit of that name, which is first available in the
Industrial Age. In the Modern Age, you can upgrade to the Heavy Machinegun, and
later, in the Information Age, the Advanced Machinegun. The German MG-42 is especially
deadly, but available only to Germans
of course.
Machineguns in Rise of Nations fulfill a role similar to that of their historic
counterparts. They are extremely powerful against all foot units, and have a high
rate of fire. But they are easily done away with by enemy armored vehicles of all
types, so it is best to keep them in close proximity to your own tank-killers, be
these Bazookas, Tank Destroyers (if you have them), or Tanks themselves.