The US Air Force is part of the American military. It is believed that the United States Air Force has been trying to cover up the UFOs it has found. It is believed that they store these aliens and alien spaceships in a place called Area 51. It is located in Nevada. People do not have easy access to this Area 51 even those who are part of the Air Force.
However, Area 51 is used by the military for common military training and other operations that occur on other bases. Yet, people believe that the US Air Force has UFOs and aliens housed in the buildings on Area 51, but they have never been caught or exposed for housing these aliens.