Remember the retro posters used by the U.S. government during the world war to recruit military men and women?

Today, the U.S. government, specifically NASA, resurrected the retro style recruitment posters, but not to encourage people to enlist in the navy or the air force, but to work on Mars!

The series of eight photos can be downloaded on NASA's website. But don't get too excited, the posters don't mean a person can actually apply to NASA for to receive a job offer on Mars. The posters are promotional paraphernalia for the agency's upcoming mission to the red planet.

NASA is known for their public domain and free access policy on some of its databases, being a government agency, they allow people to access some of their resources. As for the posters, they come in two sizes, 6.8 MB for the JPEG versions and 92.72 MB for the TIFF versions, which can be re-used and reprinted for non-commercial use.

"Mars needs you! In the future, Mars will need all kinds of explorers, farmers, surveyors, teachers...but most of all you! Join us on the Journey to Mars as e explore with robots and send humans there one day," said NASA on the official "Mars Explorer Wanted" page.

NASA released eight retro posters with different designs. The set consists of the generic "Mars Explorer Wanted" and "We need you" posters and the rest are themed after specific jobs such as teaching, engineering and farming. Mars will apparently need surveyors and technicians, too, in the future.

The latest astronaut class yielded about 18,000 applicants and the agency needed more, according to a report by Business Insider.