In the years following World War II, the concept of physical fitness suddenly became a national concern. As mechanization diminished the need for hard labor, unprecedented amounts of recreation time created a more sedentary lifestyle for Americans. Made worse by the mesmerizing (and still relatively new) influence of television, the government took notice of "The Soft American" and began promoting physical fitness throughout the country.
Although started by the Eisenhower administration, these national fitness programs were even more heavily promoted by his successor John F. Kennedy, whose youthful and vital image certainly didn't hurt the promotion. One element of this campaign was a comic book story created in conjunction with DC Comics titled "Superman's Mission for President Kennedy", in which JFK asks Superman to promote his fitness program to America's youth. However, just as the story was going to press in November of 1963, Kennedy was tragically assassinated. Out of respect for the fallen President, DC pulled the story...but after encouragement from President Johnson and the Kennedy family, they went ahead and published the story in Superman #170 (1964). For a more in-depth look at the story itself, I'll refer you to Robby Reed's excellent Dial B for Blog article for some great insights and story excerpts, but needless to say...it was an amazing (if surreal) story that marked a rare confluence of pop culture fantasy and real-world history.
As you'd expect, the story triggered quite a response from Superman's young readers. In letters printed in Superman #175, most were appropriately saddened by the tragedy, yet others couldn't help themselves when it came to more comic-booky concerns...such as Superman's secret identity:
Here's the specific panel young Miss Fox was concerned about:
Of course, no Secret Service agent (eavesdropping or otherwise) could be seen anywhere in the bright neon green Oval Office, but Rose's somewhat misplaced concern (and the editor's endearing decision to play along) is actually kinda touching.
Its brevity the key to its poignancy, an even more touching letter was printed from Robert F. Kennedy Jr., who was probably about ten years-old at the time:
It's this sort of thing that gives the larger-than-life drama of the Kennedy assassination an unexpectedly human component, as a young boy (albeit a somewhat famous young boy) offers a brief "thank you" on behalf of his uncle (albeit an uncle who just so happened to be the President of the United States).