Anyone ever tell you that the triangular 'ufo' you saw was a hallucination? Well.. here's a patent application for one that lists the mechanics:
https://www.google.com/patents/US20060145019
much more on this topic, including testimony from over 100 military whistleblowers can be found in the relevant katalist at ureka, here: you are welcome. you can find much more on this topic that blows the whole thing open in the katalist at ureka, here: https://www.ureka.org/katalists/view/94954/government-military-already-admitted-extra-terrestrials-are-with-us-and-we-are-using-their-tech
btw, this technology is related to the common 'lifter' concept you can easily make at home: