Arma 2

Global, Action, Strategy, Simulation, Multi-player, Partial Controller Support, Single-player, Co-op, Includes level editor, Captions available, Tradable

Link to the game in Steam

Building on 10 years of constant engine development, ARMA II boasts the most realistic combat environment in the world. It models real world ballistics & round deflection, materials penetration, features a realtime day/night cycle and dynamic wind, weather and environmental effects.