Pictured left to right are astronauts Russell L. Schweickart, David R. Scott, and Edwin E. "Buzz" Aldrin. Schweickart served as Lunar Module Pilot for the Apollo 9 mission. Scott flew on the Gemini 9 mission, served as Command Module Pilot on Apollo 9, Mission Commander on Apollo 15. Aldrin flew on the Gemini 12 mission and served as Lunar Module Pilot for the Apollo 11mission; during which he became the second man to set on the moon.
Credit: L-R Russell L. Schweickhart, David R. Scott, Edwin E. Aldrin: MIT Alumni on Apollo/Saturn V missions