The Apollo 15 prime crew astronauts from left: Commander David R. Scott, Command Module Pilot Alfred M. Worden, and Lunar Module Pilot James 
B. Irwin

Apollo 15 was the ninth manned mission and was the first where the
Lunar Roving Vehicle was used. It concluded on August 7. At the time,
NASA called it the most successful manned flight ever achieved.

The Apollo 15 36-volt electric Lunar Roving Vehicle was one of three that went
to the Moon