If I recall correctly, only two astronauts landed on the moon. The third one had to remain aboard the spaceship that was orbiting the moon while his two comrades went down to the surface.
Henry[TELECOM Digest Editor's Note: You are probably correct. And of course there is now the theory which has been making the rounds for a while which claims the entire thing took place either at 'area 51' or some other back lot in Hollywood; that no one got even close to the Moon. PAT]