Literally thousands of government employees are sworn to secrecy at the base called Area 51. Why? It is known for a fact that many USA aircraft are designed and tested there, and for national security reasons, these state-of-the-art planes and weapons demand secrecy.
But is that the only reason for the veil? Many think not. Many reports have come from this clandestine site of reverse-engineering of UFOs, test flying UFOs from other worlds, and development of our own designs based on craft captured from other galaxies. The employees who work under the shroud of mystery are flown to the base in an unmarked Boeing 737 to perform their duties.
Spacecraft of Futuristic Design, yeah indeed
Helen Frost Lawsuit
The Air Force has acknowledged the existence of the Nellis Range Complex near the Groom Dry Lake for many years now. There are a variety of activities, some of which are classified, throughout the complex.