S71-23774 (11-12 March 1971) --- A wide-angle view showing two members of the prime crew of the Apollo 15 lunar landing mission riding in a Lunar Roving Vehicle trainer called "Grover" during a simulation of lunar surface extravehicular activity in the Taos, New Mexico area. They are astronauts David R. Scott (riding in left side seat), commander; and James B. Irwin, lunar module pilot. Apollo 15 will be the first mission to the moon to carry a Lunar Roving Vehicle, which will permit the astronauts to cover a larger area for exploration and sample collecting than on previous missions.