1951 ... duck and cover!

... with Russia recently getting it's own A-Bomb, and very little in organized warning or air defense, a blinding flash of light might be your first clue to the start of World War Three!

1952 ... civil defense



1960 ... more good guys

... James Stewart was a distinguished bomber pilot during WW2. He remained in the Air Force Reserves for most of his life. He retired at the rank of Brig. General.

http://en.wikipedia.org/wiki/Jimmy_Stewart#Military_service

It's sort of strange to imagine that George Bailey kid dropping hydrogen bombs- but he does get kinda riled once in awhile.
http://www.youtube.com/watch?v=ruE8yhkHke8