tell and explain to the public if there are any secret aircraft at Area 51 and tell us about the aircraft models

I have heard many stories about secret flight aircraft in Area 51. I would like this to be explained. Which aircraft are you flying? What types of aircraft are these? Why are you hiding them from the public. I am using the Freedom of Information Act. A number of years ago, a man named Bob Lazar claimed to have worked at Area 51 and saw a flying saucer and worked on it. Now I know many people may think this is a crazy petition, but I am curious, and so are many other people. What are you hiding from us? Please explain.