I was a kid of the 60's and 70's so I don't remember the government warning me to "Duck and Cover." However, this is what millions of school children in the 50's and early 60's were urged to do when they "see the bright flash." That flash, of course, would have been a nuclear warhead and although none had been used since World War II, the U.S and Russia were in the midst of a Cold War. The government ran Public Service Announcements featuring a shy turtle that was very scared of the "bright flash." He was taught to "Duck and Cover." Add some catchy music and the comforting voice of an announcer and that was essentially the commercial. Here it is.