JCOVE (Joint Combat Operations Virtual Environment
JCOVE Lite is a freeware game derived from Bohemia Interactive's VBS2 software - itself a derivative of Armed Assault but focused on simulated training for military purposes. JCOVE Lite was funded by the UK MOD to give the general public, particularly potential recruits, an idea of how the British military trained for combat as well as providing a more realistic combat simulation than your standard shoot'em-up. Overall it gives serious gamers an immensely modifiable platform to create, share and play their own missions using a huge range of British military equipment - from the humble Sig 229 to the legendary Challenger 2 Main Battle Tank. It is available for free from Armed Forces Careers Offices around the UK, as well as available to download publically for all registered community members at jcove-lite.co.uk.
Two maps, training range in the UK and Iraq. Enemy are conventional Soviet types or Taliban. It is based on a highly modified version of ArmA1 VBS2 (Virtual Battle Space 2) is a very expensive made for military available to public simulator that covers many western nations but this is a free way to try it from the British point of view. Only 2.3GB download

VBS2 JCOVE -
http://www.jcove-lite.co.uk/VBS2 -
http://virtualbattlespace.vbs2.com/