Arma 2: British Armed Forces Steam Key GLOBAL

In summer 2012, less than two months after Operation Arrowhead successfully routed the Takistani military regime, NATO coalition forces face a large-scale outbreak of guerrilla insurgency.
A mechanized force of British troops, with support elements of US Army TF Knight, are about to deploy and embark upon a large scale counter-insurgency that will define the future of the coalition presence in Takistan.

Additional info about ARMA II series:
Building on 10 years of experience and constant engine development, ARMA II: British Armed Forces 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.