Surveyor program
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The Surveyor program was a NASA program that, from June 1966 through January 1968, sent seven robotic spacecraft to the surface of the Moon. Its primary goal was to demonstrate the feasibility of soft landings on the Moon. Wikipedia
First flight: May 30–June 2, 1966
Start date: 1966
Cost: US$469 million
Failures: 2
Last flight: January 7–10, 1968
Launch vehicle(s): Atlas-Centaur