Arma II: Operation Arrowhead is a standalone product and does not require the original Arma II. 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 line up 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, materials penetration, features a realtime day/night cycle and dynamic wind, weather and environmental effects. Features PLAYER-DRIVEN STORY - Command your troops through a branching campaign full of twists and surprises. THRILLING REALISM - Explore the 225 square kilometer of highly detailed landscape, modelled using real-world geographical data and master each of 81 weapons and 120+ vehicles. AUTHENTIC SIMULATION - Game simulates various aspects of combat and evironment effects from bullet ballistics, material penetration, ammunition types and stopping power to weather conditions. EXTENSIVE MULTIPLAYER - Play the campaign missions in cooperative mode or join duty in the massive multiplayer battles with up to 50 players. ADVANCED AI - Compete the ultimate next-gen AI: no scripts, no predefined pathways. All units react on actual game situation. MISSION EDITOR - Design your own missions by the intuitive, easy-to-use mission editor and become part of one of the biggest and most creative PC gaming community ever. CHEAT PROTECTION - Optional anti-cheat BattlEye (www.battleye.com) available to help secure dedicated servers. In addition BE adds 'RCON' (remote control) for game's dedicated server software. DEDICATED SERVER - To support smooth multi-player experience there is 'dedicated server software' available for Windows (included with game) and Linux (download-able from game's website).