There has been much discussion about the possible existence of a legacy Unidentified Anomalous Phenomena (UAP) program that holds an inventory of retrieved UAP craft.

Such a program would be heavily involved in trying to reverse engineer the technologies that allow these vehicles to exhibit anomalous performance characteristics without discernible means of propulsion.

This article aims to explore how this process might work, the methods of testing involved, and the current status of such technology.

https://www.liberationtimes.com/home/reverse-engineering-ufos-and-the-alien-reproduction-vehicles