Flying saucers are just secret weapons based on well known 1920s experiments in boundary layer control. The best book to read on the technology is “Intercept UFO” by Renato Vesco.
https://www.amazon.com/Intercept-UFO-Renato-Vesco/dp/B001Q3ZOCY
So there has been this fantastically superior technology for nearly 100 years and no military in the world has developed and used it?