The U.S. Government Conducted Secret Experiments On the Moon During The Apollo Missions
It should be noted that the United States most certainly did experiments on the Moon when they arrived. The astronauts notably did several experiments to find out some basic information about the ground, environment, rocks, etc. None of this remained a state secret, however. It is widely believed that there were some secret experiments done at the time. However, anything that was done during all the Apollo missions is now 100% public record. Therefore, it is possibly true that secret experiments did take place but nothing is secret today. NASA has even released the entire correspondence with mission control for all the missions too.