Fun fact: "Government propaganda" was almost unknown before the First World War. (No pre-war encyclopedia, including the 1911 Britannica, for example, has an entry for "propaganda.")

The point isn't that the DHS picture is propaganda, but that its message is (shall we say?) startling.   

Furthermore, the idea that America will resemble a surfer's dream in 1966 (but without surfboards or people) is (shall we say?) unconvincing.