Pray that a nuclear attack never happens because the results will be devastating for all. The radiation will kill more than the blast. The idea is that because the other side has some ability to shoot down our missiles and not all missiles will be on target, we will launch a large number and the other side will do the same. As General Harris pointed out, any missile defense system gets overwhelmed by multiple missiles so missiles will get through. A small country like North Korea, in an attack will launch unarmed or non-nuclear missiles with unclear missiles to overwhelm the missile defense.