Most of you probably already know about the Glocke, but this wasnt the only UFO build by the Nazis. In fact, the earliest UFO sightings-wave go back to the to the end of WW2

https://en.wikipedia.org/wiki/Foo_fighter
>The first sightings occurred in November 1944, when pilots flying over Germany by night reported seeing fast-moving round glowing objects following their aircraft. The objects were variously described as fiery, and glowing red, white, or orange. Some pilots described them as resembling Christmas tree lights and reported that they seemed to toy with the aircraft, making wild turns before simply vanishing. Pilots and aircrew reported that the objects flew formation with their aircraft and behaved as if under intelligent control, but never displayed hostile behavior. However, they could not be outmaneuvered or shot down

And as you can see the research did continue to at least 1965 when a UFO resembling the Glocke crashed in Kecksburg (Pic related)

In general UFOs are an undeniable fact

This was released from the Chilenian Navy, basically saying "we have no idea what it is. maybe one of you guys can tell us."
https://www.youtube.com/watch?v=NkUTGpegZN0
https://www.cia.gov/library/readingroom/docs/CIA-RDP79B00752A000300130001-1.pdf
Even entire cities saw them
http://www.ufocasebook.com/2010/madagascar1954.html
https://en.wikipedia.org/wiki/Phoenix_Lights

Some of them even simply deactivated our nukes
http://www.telegraph.co.uk/news/newstopics/howaboutthat/ufo/8026971/Aliens-have-deactivated-British-and-US-nuclear-missiles-say-US-military-pilots.html

When that UFO in Rosswell then crashed it was probably easier to say those are some aliens than explaining how some Nazi in SS-uniform flies around in an highly advanced aircraft years after they were completely "obliterated".

However nowadays many of the UFO sightings are probably replications of the original Nazi UFOs.