The Apollo 15 mission was the first to include the Lunar Rover, a wheeled vehicle that greatly expanded the range of lunar exploration. During their three days on the Moon, astronauts Dave Scott and Jim Irwin went on three excursions with the Rover.
Dave Scott: Got a good picture Joe?
Joe Allen: Good picture, Dave, have at it.
Dave Scott: Okay. To show that our good Postal Service has deliveries any place in the universe, I have the pleasant task of canceling, here on the Moon, the first stamp of a new issue dedicated to commemorate United States achievements in space. And I'm sure a lot of people have seen pictures of the stamp. I have the first one here on an envelope. At the bottom it says, "United States in Space, a decade of achievement," and I'm very proud to have the opportunity here to play postman. I pull out a cancellation device. Cancel this stamp. It says, " August the second, 1971, first day of issue. What could be a better place to cancel this stamp than right here at Hadley Rille. By golly, it even works in a vacuum.