Apollo 15 was the 9th manned mission in the Apollo program and 4th to land on the moon. It was a successful mission although controversial as the astronauts carried unauthorized postage stamps which they planned to sell. Commander David Scott, Lunar Module Pilot James Irwin and Command Module Pilot Alfred Worden were on board. The Mission lasted 12 days 7 hours, which included 1 cislunar EVA and 4 lunar surface EVA's. This was also the first mission the lunar rover was used.