CTU: Marine Sharpshooter

From the back of the box:

Dropped behind enemy lines, you have uncovered a terrorist plan to construct a nuclear weapon and detonate it on American soil. You must follow the plot from the deserts of Afghanistan through the Russian winter and into the jungles of a small south pacific island. Armed with an arsenal of precision sniper weaponry, your only assistance is provided by your observer, your eyes, ears and close quarters machine gun. Make every shot count, your country is depending on it.