The American retro reflectors that were allegedly placed on the moon by NASA astronauts have never worked - laser return signals have always been no different than if the laser had bounced of the bare surface of the moon:
As evidenced by the fact that it was the demonstration of this natural reflection that led to the program claiming to want to place these units on the surface.
The American retro reflectors that were allegedly placed on the moon by NASA astronauts have never worked - laser return signals have always been no different than if the laser had bounced of the bare surface of the moon:
https://arxiv.org/ftp/arxiv/papers/1805/1805.05863.pdf
As evidenced by the fact that it was the demonstration of this natural reflection that led to the program claiming to want to place these units on the surface.