The United States has a policy that no person, other than a deceased president, will be honored on a postage stamp until at least 10 years following his/her death. At the same time, the first instance of a person walking on the Moon certainly is reason for a postal commemoration. Thus, although not mentioned, Neil Armstrong is depicted stepping from the Eagle onto the Moon's surface.
Armstrong was a combat fighter pilot who also had a college degree in aeronautics. He went to work for the National Aeronautics and Space Administration as a research pilot and was selected to become an astronaut in 1962. His first space venture was in March 1966 in Gemini 8. That craft went out of control after six orbits and had to make an emergency landing near Okinawa. The Apollo 11 mission was perhaps the most visible scientific project ever, with hundreds of millions of people watching on television. Armstrong statement on touching the Moon's surface was, "That one small step for man, one giant leap for mankind."