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The sign accompanying the FLEEP. It reads

Flying Lunar Excursion Experimental Platform:
FLEEP

FLEEP was used in a research program to explore and evaluate design approaches for a lunar flying vehicle. Handling and other piloting problems were studied with the pilot in a standing position in the simulated lunar gravity field with six degrees of freedom. The lunar rover was chosen as the exploration vehicle.

The photo in the middle of the sign actually is a picture of the Lunar Excursion Module Simulator (LEMS) suspended from Langley Research Center's Lunar Landing Research Facility. However, both the LEMS and the FLEEP were designed to be used or tested in the LLRF.