Our mortal enemy the Soviet Union possessed a bevy of ICBMs that could devastate US cities. The Chinese have such a fledgeling arsenal. But here we are "worried" about Iran with a handful of intermediate range missiles, but no arsenal and certainly nothing to top them off with except conventional warheads.

The MIRVd nuclear warheads atop the 24 ICBMs in a typical US nuclear submarine culd devastate not only Iran, but the entire middle-east and irradiate it for 10K years.