But I could easily see ISIS using a nuke or dirty bomb. If they (or some other terrorist group) does end up using a nuke there is imo 3 likely targets. 1: DC. What better target than a nations capitol? That is after all where "the work" gets done and taking that out would create chaos across the country. 2: NYC. Why? Because it has 8.34 million people...and terrorists seem to LOVE targeting high population areas. Plus its the money hubbub of the US. 3: Oklahoma. Why? Because it is considered as being the heart and center of the US and getting a nuke into the middle of the US would mean that they could get a nuke anywhere into the US which could cause a panic all of its own type and be just as devastating as the other two choices.