ITT I will post a lot of hints showing that the Nazis build flying Saucers, including wittnessreports released by the FBI, a CIA report including a picture resembling closely the alleged Haunebu II flying saucer, as well as Newspaper article dating back to WW2.

For starters, early UFO sightings go back 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.

This here was releast from Chilean Navy stating they basically have no idea what it is.
https://www.youtube.com/watch?v=NkUTGpegZN0
https://www.cia.gov/library/readingroom/docs/CIA-RDP79B00752A000300130001-1.pdf

In some cases entire cities saw the UFO.
http://www.ufocasebook.com/2010/madagascar1954.html
https://en.wikipedia.org/wiki/Phoenix_Lights

And they have been reported to simply turn of nukes
http://www.telegraph.co.uk/news/newstopics/howaboutthat/ufo/8026971/Aliens-have-deactivated-British-and-US-nuclear-missiles-say-US-military-pilots.html

pic related is a german POW that talks about an aircraft whichs description fits a flying saucer, started from a german facillity. its page 91 of
https://vault.fbi.gov/UFO/UFO%20Part%2012%20of%2016/view