Welcome to KSP Weekly everyone. In 1971, the ninth manned mission of the Apollo program took place, Apollo 15. It was the fourth to land on the Moon and it was the first mission on which the Lunar Rover Vehicle was used. The mission began on July 26 and ended on August 7, but it was on this day, an hour before the burn to take the crew back home, that the last activity in lunar orbit took place: the release of the Apollo 15 Particles and Fields Subsatellite (PFS-1). The satellite was released in