The british army is gonna use a CS-like mod with the HL engine for virtual military training...its true straight from BBC website:

"The Ministry of Defence hopes the system may help reinforce some of the lessons learned on more traditional training exercises.

Like the popular modification, or mod, of Half-Life known as Counterstrike, the army version allows up to eight soldiers to go into virtual combat at any one time."
"Most of our imports come from outside the country" -George W. Bush