the government doesn't release technology to the public unless it's been developed and in use for at least 10 years
25 years would be closer.
we all know what's really going on at Area 51... airplane testing
Between that and spaceplane prototypes, yes. (Spaceplane = like the Shuttle, but bigger, faster, sleeker)
Some flying saucer accounts from the region are actually grounded in fact. In the closing days of WW2, America sent a secret team of soldiers and scientists, code named Operation Paperclip, to Germany to collect as much information as possible about the Germans' experimental projects and to capture as many of their leading scientists as possible. Many of the projects were decades ahead of their time. Some of these included flying wing fighter and bomber designs, plans for a sub-orbital, trans-global bomber capable of delivering nuclear weapons from Germany to any point on Earth, and a strange craft called The Bell. The Bell was in essence a flying saucer, in that it was round and somewhat cone-shaped. Very little is known about it, but the available information suggests that it was designed to fly at extreme speeds within the Earth's atmosphere and possible also travel outside it. The data collected by Operation Paperclip led to many of the new and unusual designs from the Cold War era to today, including the B-49 and B-2 flying wing bombers, the saucer-shaped Avro Air-Car prototype, the concepts that led to the development of stealth materials like those on the F-117 and F-22, and the rockets that sent man to the Moon. A vast majority of these designs, prototypes, and operational aircraft had their origins at Area 51, and they have been carefully kept secret to ensure that enemy powers cannot duplicate or counteract our capabilities. It is important to note as well that the Germans were not using alien technology any more than we are. Both them in their time and us in the present employ some of the best scientists and engineers in the world, and these people naturally come up with ideas that are beyond the normal. That's why they're the scientists and we're not.
Another facet of the Area 51 UFO enigma is simple misinformation. The public believes there are UFOs at Area 51, so by encouraging that notion the government gives people something to look for that will distract them from the real work being carried out on new tech. It is literally a case of hiding in plain sight.
There is a fine line that must be walked, though. While new military developments and operations must be kept secret to preserve national security, the government should not be allowed to keep other secrets from the citizenry. Things like new laws and restrictions being crafted, which most times takes place behind locked doors and in back rooms, should be open. Additionally, secret governmental spying on the public should not only be exposed, but also be stopped and the means for it destroyed. What it all boils down to is that there are good secrets and bad secrets, and while it is the governments' responsibility to walk the line between the two, it often falls into the dark side of the issue. When this happens, they must be exposed. That in fact is part of the basis for the original way that the government was established in the Constitution, so that it would be open for all to see. Unfortunately, that has been ignored or defied by corrupt people seeking to advance their own agendas and plans to gain more and more control, and this therefore is why there must be an immediate return to true Constitutional government in America today.