ArmA II: Combined Operations is a bundle that includes both the original ArmA II and the massive ArmA II: Operation Arrowhead expansion.
ARMA II — The 27th U.S. Marine Expeditionary Unit has been deployed to the former soviet republic of Chernarus: a small country chained to the threat of an upcoming civil war. Force Reconnaissance Team “Razor” is among the first to fight. This elite five-man team is about to fall down the rabbit hole, trapped in a war not only for control of the country, but also the hearts and minds of its people. Arma II is based on the latest generation technology, offering large –scale game world, authentic and extremely detailed modern units, weapons, vehicles and environments, challenging single player and vast array of multiplayer options.