The Early Access Beta, or the multiplayer beta, of Act of Aggression began on July 17, 2015. The Early Access Beta adds the Chimera and later the Cartel as playable factions, and allows player to battle against AI in singleplayer or multiplayer.
Three playable factions: initially the United States Army and the Chimera. The Cartel was later added on August 6, 2015, during Gamescom 2015.
Battle against AI: very easy, easy, medium, hard, very hard.