Bohemia Interactive has announced the development of ArmA II Operation Arrowhead, a standalone expansion pack to its PC military simulation title ArmA II.

Set three years after the conflict in Chernarus, portrayed in the original ARMA II, a new flashpoint in the Green Sea region heats up and coalition forces led by the US Army are sent to Takistan to quickly restore peace and prevent further civilian casualties.

Set in the hilly environment of central Asia, Operation Arrowhead promises a realistic simulation experience in a modern day setting with unprecedented freedom of movement, actions and tactics. Players will enlist into various roles within the US Army, from basic infantrymen, through special operatives, to pilots and tank crew.

"Bohemia Interactive is fully committed to supporting the existing ArmA II user base whilst also working on the expansion pack, this will not only allow us to introduce a new and original theatre of war to the simulation series, but also improve numerous areas of the core game, for both the original game and the expansion, where we can go even further with adding completely new features," said Marek Spanel, Bohemia's CEO.

ArmA II Operation Arrowhead will be demoed at gamescom next week.