Joseph Rotblat

The most terrifying moment in my life was October 1962, during the Cuban Missile Crisis. I did not know all the facts - we have learned only recently how close we were to war - but I knew enough to make me tremble.

By irreducibly complex I mean a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning.

Deterrence is still fundamentally about influencing an actor's decisions. It is about a solid policy foundation. It is about credible capabilities. It is about what the U.S. and our allies as a whole can bring to bear in both a military and a nonmilitary sense.