It's speculated that it was actually after 1955 that it became "Aikido for everyone".
I think a lot of the propaganda can be found in the later 50's. The US occupied Japan until '52, so figure a few years to get things together and consolidate the message and that would put you later into the 50's. I like to use "Rendez-vous with Adventure" as a firm measure for my publicity comments and that was published in '58. Nothing says baby boomer like that guy's voice from every documentary created between 1950 and 1972.