Apollo 15 was the ninth manned mission in the Apollo space program. the fourth
to land on the Moon and the eighth successful manned mission. It was also the first
long duration stay on the Moon. There was a greater focus on scientific work with
the first use of a Lunar Roving Vehicle (below). Commander David Scott and Lunar Module Pilot James Irwin spent three days on the Moon and a total of 18½ hours
outside the spacecraft with the Lunar Rover. The mission concluded on August 7
and was called the most successful manned flight ever achieved.

Photo taken by Jim Irwin shows Apollo 15 Commander Dave Scott on the lunar
surface next to the Lunar Module Falcon, Saluting the Flag,