Jets in 66 combat missions in Korea, shot down two MIG-15's, and was decorated with the Distinguished Flying Cross. After a tour of duty in Germany flying F100's, he went on to earn his Doctorate of Science in Astronautics at MIT and wrote his thesis on Manned Orbital Rendezvous.

Selected by NASA in 1963 into the third group of astronauts, Aldrin was the first with a doctorate and became known as "Dr. Rendezvous." The docking and rendezvous techniques he devised for spacecraft in Earth and lunar orbit became critical to the success of the Gemini and Apollo programs, and are still used today. He also pioneered underwater training techniques, as a substitute for zero gravity flights, to simulate space walking. In 1966 on the Gemini 12 orbital mission, Buzz performed the world's first successful spacewalk, overcoming prior difficulties experienced by Americans and Russians during extra-vehicular activity (EVA), and setting a new EVA record of 5 hours. On July 20, 1969, Buzz and Neil Armstrong made their historic Apollo 11 moonwalk, becoming the first two humans to set foot on another world. They spent 21 hours on the lunar surface and returned with 46 pounds of moon rocks. An estimated 600 million people - the world's largest television audience in history - witnessed this unprecedented heroic endeavor.

Biography credit to buzzaldrin.com