Era: The bonus increases the availability of the units by certain percentage.Also they only allow certain type of units to be used in the deck Type: The bonus changes the costs of certain slots so that they become very cheap, but at the cost of limiting one of the category into only 3 slots available.However, like the name suggests, only units specific for the nation can be added (So no combining Leopard 2s with M1A1 for example)
Nationality Deck: The bonus unlocks access to prototype units and gives more activation points to the deck (+1 and +2 respectively for the USSR and USA), and more for minor nations.These points can be altered by these bonuses though, which are available when starting a new deck. Each slots in different category cost different activation points. 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.
