This is the sad part. Some of those morphing flying space craft are back engineered and are ours. See this video from the X Conference in 2004.
http://vodpod.com/watch/1277931-xcon...e-for-reverse-
In addition, according to Col. Corso's son the biggest secret of the air force shadow government is that these space crafts are interdimensional and do indeed time travel. That is why so many of us who are older, who are aware of what was in the past, see and know some things have been altered on this time line. At times some of us are able to sense when it shifts. Even some people who we knew had died in the past were not dead on the altered timeline. In a more recent situation, involving the elections, Hillary was suppose to have won the Presidential elections but did not. That timeline had been altered in early July of last year. Because the time line keeps being altered - those of us who used to be able to sense into the future find it much more difficult to sense past the immediate timeline because due to the ongoing timeline shifts what was suppose to happen did not. When they say all bets are off - indeed they are.
When one reads stories about the crashed craft from Roswell being from the future and being from us - it now makes sense. One of the things that was identified about the bioengineered robotic bodies of the EBT was that there were two brains = one half more human like and the second brian more crystal like that may have had some type of interdimensional transmitter. In fact, the military has been involved in time-travel since the 1940s beginning with the Philadelphia experiment. The crashed space craft was a gift from our present day time... 1947's future.
The other issue which attracted many other ETs to this planet was the explosion of the Atomic bomb as that was an interdimensional explosion as well and affected multi-dimensional ET life. Supposedly it opened a rift for a warring ET group to slip through to here and of course - they too are time travelers affecting earth's history as well. Knowing some of this other info makes Dr. Who's time traveling Tardis a wee bit more credible.
In fact, the more I learn about all of this the more it appears that reality far outstrips any fantasy anyone could possibly make up regarding the ET presence on this planet.
Stephen Basset talkes at the 2005 - X-Conference on UFOs
http://vodpod.com/watch/671951-xcon-...nal-press-club
I did attend the 2008 X-Conference which was very interesting as well.