Doing that would require both serious reconnaissance to know where to attack, and enough weapons surviving our counter-stroke.  And of course we could play the same game, or at least continue hunting and knocking out their weapons.<p>The study has to make some simplifying assumptions, and you could evolve it yourself by assuming some fraction of those surviving get zapped in due course.  But not likely all.<p>The plan was, though, to put us down for good, Western Europe was the prize, the US an obstacle to taking it, and too far away to seriously occupy and extract value from.