First Person on Wheaties

I was asked earlier today “Who was the first person on the Wheaties Box?”. I thought a web search would turn up a quick answer but I have been unable to locate a definite answer the closest I have came is this list. However, I don’t think this is a complete list, and I am confused as to why Jack Armstrong, who is listed as a fictional character whould be on the wheaties box at all. Any help would be greatly appreciated.

It’s because General Mills invented wheaties, owned a radio station, invented Jack Armstrong(All-American Boy) and the radio show to go with it to sell the cereal. From here among many other sites.