The Apollo 10 mission, which lifted off on May 18th, 1969, was a complete staging of the Apollo 11 mission without actually landing on the Moon.

Apollo 10 was the second mission to orbit the Moon and the first to travel to the Moon with the entire Apollo spacecraft configuration. Astronauts Thomas Stafford and Eugene Cernan descended inside the lunar module to within 9 miles (14 kilometers) of the lunar surface command achieving the closest approach to the Moon until Apollo 11 landed two months later.