Rainbow 6
Tom Clancy's Counter-Terrorism Squad in action.
An excerpt from the Rainbow 6 manual.
"Rainbow Six is a game developed in honour of the brave men and women who guard the back doors of governments around the world, standing ever ready in the shadows to meet whatever threat may present itself. Although this is a work of fiction, and no such internationally wielded counterterrorism unit is currently recognised by the nations of the world, cooperation and cross training between each of the existing special operations units is not only common, it is highly encouraged. Consequently, the reality of this gaming environment is not as far removed from our own as some might hope."
Never going for the cheap laugh, Cube 2 shows us now an acurate simulation of what counterterrorism combat is like.