Three years after the conflict in Chernarus, portrayed in the original Arma 2, a new flashpoint explodes in the Green Sea Region. Coalition forces led by the US Army are deployed to Takistan to quickly restore peace and prevent further civilian casualties.You will enlist into various roles within the US Army, from basic infantrymen, through special operatives, to pilots and tank crew in this new installment in the award-winning lineup of military simulators for PC from Bohemia Interactive.Building on 10 years of experience and constant engine development, Arma 2: Operation Arrowhead boasts the most realistic combat environment in the world. It models real world ballistics & round deflection, thermal imaging, and materials penetration, and features a real-time day/night cycle and dynamic wind, weather, and environmental effects. NOTE: Arma 2: Operation Arrowhead is a standalone product and does not require the original Arma 2. Features: NEW PLAYABLE CONTENT: New story campaign for both SP and MP gameplay. Wide range of new tutorials, single scenarios, and multiplayer modes.MASSIVE GAME WORLD: Three brand new Central Asia-style large maps including expansive urban, desert, and mountainous terrain featuring a fully destructible and interactive environment.ULTIMATE WAR EXPERIENCE: Fully integrates with the original Arma 2 for unmatched warfare simulation. UNIQUE GAMEPLAY ELEMENTS: Detachable backpacks with equipment, advanced weapon optics, material penetration modeling, remote real-time simulation of Unmanned Arial Vehicles (UAV), freedom of decision, and repercussive actions. EXTRA UNITS AND VEHICLES: Multiple factions from all sides including the US Army, United Nations, Takistani Army, and Guerrillas made a collection of 300+ new units, weapons, and vehicles. MISSION EDITOR: Design your own missions with the intuitive, easy-to-use mission editor and become part of one of the biggest and most creative PC gaming communities ever. GAME MODIFICATION: Create Your own custom game content with a complete editing tools suite (freeware SDK kit) and modify the game in ways where the only limitation is Your own imagination. EXTENSIVE MULTIPLAYER: Play the campaign missions in cooperative mode or join duty in the massive multiplayer battles with up to 50 players. CHEAT PROTECTION: Optional anti-cheat BattlEye is available to help secure dedicated servers. In addition, BE adds 'RCON' (remote control) for the game's dedicated server software. DEDICATED SERVER: To support a smooth multi-player experience there is 'dedicated server software available for Windows (included with the game) and Linux (downloadable from the game's website).