Apollo 15 was the fourth manned mission to the lunar surface, launching on the 26th of July, 1971. As the first of the Apollo “J” missions, it was equipped for longer stay times on the lunar surface — and was the first to carry an electric Lunar rover to improve the astronauts surface mobility (for this mission, up to 5 km from the landing site).
The Apollo 15 command module was named Endeavor, after the ship that carried Capt. James Cook on his 18th century exploration of the Pacific. After its flight, the module wound up in the Museum of the Air Force due in no small part to the fact that it was the only Apollo mission with an all-Air Force crew.