All the units are unlocked, but there are limitations to what you can add, through Activation Points: all decks have 33 Activation Points initially. The deck in Wargame: AirLand Battle works in a very different way. In Wargame: European Escalation, players must first complete objectives from the campaign and multiplayer matches to earn stars, which is the currency to unlock new units and their variants to be added to their deck. The deck in Wargame: European Escalation initially has a very few (and mostly underperforming) units unlocked.