The Apollo 15 mission began when the Saturn V launch vehicle blasted off from KSC on July 26, 1971, and ended when the astronauts and the Command Module "Endeavour" were recovered by the aircraft carrier on August 7. Onboard "Endeavour" were Mission Commander David Scott, Command Module Pilot Alfred Worden and Lunar Module Pilot James Irwin. The Lunar Module "Falcon", with Scott and Irwin aboard, landed on the Moon on July 30, and remained there for just under 67 hours. The mission set several space records and was the first to use the lunar rover. Scott and Irwin rode it to explore the area around the landing site during three periods of extravehicular activity (EVA). On August 2, before finishing the final EVA and entering the Lunar Module, Scott used a special postmarking device to cancel a first day cover provided by the United States Postal Service bearing two new stamps, whose designs depicted lunar astronauts and a rover, commemorating the tenth anniversary of Americans entering space. That cover was returned to the Postal Service after the mission, and is now in the Smithsonian Institution's National Postal Museum.