Except of course, the money you set aside to purchase AA guns or factories. There are 10 military units in the game. The land-based units include infantry and tanks. The tank's ability to blitz through enemy controlled territories makes it an effective weapon for gaining the initiative. A new addition to Iron Blitz is the Marine.
Marines are just like regular infantry unless they happen to be making an amphibious assault.
Then they perform as well as tanks. Fighters and bombers are the two air units. Bombers can be used to attack enemy units or the industrial production certificates of a country directly. The ship models in the game are equally versatile. The transport is used for ferrying troops and AA guns across water.