This type of craft has been widely reported worldwide as a UFO for decades.
First appearing in the early Eighties during a UFO Sighting wave over Belgian Germany continuing to the present day. This alleged U.S. patent suggests that the Black Triangle UFO Sightings are not extraterrestrial but back engineered Military craft. TR-3B has the ASTRA code name. The first operational tactical recognition flight was in the early 1990s. The triangular aerospace nuclear platform was under the Top Secret and was developed in the AURORA Program money from the U.S. “Black Budget”. credit Chiriac Nicolae