Units in Steel Division are divided into 7 categories. Reconnaissance, Infantry, Tanks, Support, Anti-Tank, Anti-Air and Air. For each division, you can choose from a different set of unit cards for your deck. Those unit cards vary in accessibility, cost and phase in which you can call them in. Each division can field units from every category but varies in the maximum number of units you can buy in each category. For example, an Airborne division can pick a lot of air units but just a few tank units, visa verse for Tank divisions. This way units make every division unique in their gameplay and style.