Gather up your can-do spirit, because these WWI-inspired NASA posters for Mars exploration are here to rile up your planetary patriotism. This set of Mars recruitment posters from the Kennedy Space Center are all kinds of fantastic.
The only problem here is that there is no Mars recruiting center. In fact, NASA is a little under-funded and, now that it's been mentioned, no one has ever set foot on Mars. Nonetheless! Your planet needs you! Mars needs you! Etc!
The posters push space exploration and the spirit of adventure, as well as the fact that the same tasks we need to do here on Earth will be needed on the soon-to-be-colonized Mars. Farmers, surveyors, teachers, and people who work a nondescript night shift (which horrifyingly appears to require the use of a harpoon) are all jobs you can sign up for at the imaginary recruiting office.