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The sign accompanying the LEMS. It reads

Behind the Scenes

Lunar Excursion Module Simulator

In front of you is the actual training vehicle used by Apollo astronauts to practice landing on the Moon. Suspended from a giant gantry at the NASA Langley Research Center, LEMS recreated the special challenges of flying the final approach to the Moon - while standing up! The ground beneath the vehicle was configured to look like the lunar surface to simulate the unfamiliar, disorienting landscape that would greet astronauts on their otherworldly voyage.