The story: Players side (U.N.A.T.C.O.) got their hands on a piece of unknown weapon technology. Before they could get it to Area 51 to analyze it the Blackhawk that was delivering it was shot down by an unknown Terrorist group & the weapon stolen. That terrorist group sold it to your enemy (Russians) & they have their own plans how to use it to set the new world order & rule the world. Unatco sent their best soldier to retrieve it back before its to late. But it gets worse,the "owners/creators" of that unknown weapon technology want it back,they cant let it in your or your enemies hands,so you could use it against them. So they start to hunt both sides down to get their technology back.