NASA's Vehicle is the Lunar Excursion Module (LEM), which was used during the Apollo program to transport astronauts from the Command Module to the surface of the Moon and back. The LEM was designed by Grumman Aerospace Corporation and was the first spacecraft to land humans on the Moon. It was also the first spacecraft to be powered by a combination of liquid hydrogen and liquid oxygen. The LEM was an essential part of the Apollo program, allowing astronauts to explore the lunar surface and collect samples for scientific study.