In multiplayer gameplay the player may choose one of four roles in battle: infantry, air, support, or armor. The infantry role gives access to various infantry squads such as anti-tank teams, snipers, and light transport vehicles whereas armor allows players to use various classes of tanks, the dominant direct fire land combat unit of the game. Players choosing the air role have access to attack, scout, and transport helicopters. Finally, the support role contains anti-air, artillery, and repair units. Each role's basic units can be purchased by everyone but are more expensive for players with a different role. In addition, each role has its own exclusive units that aren't available for purchase by other roles.