At first glance, this appears to be an American Boy Scout working on his signaling. But it’s not. It’s actually his Soviet counterpart, a Young Pioneer getting the message through. The image is from the cover of a 1977 issue of Masterok magazine, a Soviet journal designed to instill in middle school age children the necessary skills for labor education.

This issue seems to focus on communications skills, and for the beginners, it describes how to make this tin-can telephone, albeit a rather advanced version of the old staple:

It moves next to Morse signaling, showing how to make this buzzer set:

Of course, the young comrades need something to communicate about, so the magazine shows them how to make this realistic looking machine gun, perfect for taking out invading capitalist imperialists:

After all that excitement in the field, the Pioneers can relax by listening to the radio after building this three-transistor TRF set.  It employs permeability tuning, one stage of RF amplification, and two audio stages for good headphone volume.