ArmA: Combat Operations, the game developed by Bohemia Interactive and available across Europe as Armed Assault, has shipped to stores across North America, Atari announced. In ArmA: Combat Operations, players will engage in a story-driven single- player campaign or take part in huge multiplayer battles with more than 50 players on one battlefield simultaneously. Featuring a vast environment with more than 250 square miles to explore, ArmA: Combat Operations allows players to pilot or drive more than 30 vehicles including APCs, tanks, self-propelled anti-aircraft guns, helicopters and fighter planes. The game features an extremely powerful built-in editor which encourages players to create and share complex missions as well as import user-created units and maps. A playable demo can be found here.