Being of the "older" generation, this thread brings back memories of early days in school. The duck, and cover your eyes drills, underneath your desk. Like that would have made a difference....
. Also remember a few early tv dramas about this...but was long ago and far away, so don`t remember the details.
You younuns grew up in the end of the cold war, detente, and this is about the forst time world events have impacted your life.
I not only remember when the Berlin Wall came down,but when it went up...for a perspective.
So, in answer to posed question, I flat don`y know. And in all reality, we probably won`t be told, just like we aren`t told the details of why the warnings go from yellow to orange and vice versa.Some things the government keeps to itself, and that is how it should be..JMHO>