Gus Grissom
Purdue alumni include 25 astronauts, including Gus Grissom, America's second man in space and first to fly in NASA's Gemini program, Neil Armstrong, the first to walk on the moon, and Eugene Cernan, the last astronaut to do so. Over one-third of all of NASA's manned space missions have had at least one Purdue graduate as a crew member.