It is past time professionals and scientists join the larger public in taking an objective, investigative approach to UFOs. The evidence for the existence of some kind of "craft" is now indisputable. The burden of proof has shifted back to the parties on whom it should have always remained: the government, intelligence, corporate, and scientific communities who are in the know. For the skeptical reader, the following is a brief summary of the available public information.
The Department of Defense has confirmed the existence of UFOs using multiple kinds of advanced sensors, including radio and forward-looking infrared. The craft are making maneuvers that defy our established understanding of physics, by moving at extraordinary speeds, with instant acceleration, and no identifiable means of thrust propulsion.
Commander David Fravor had a dog fight with the "tic-tac" UFO during the U.S.S. Nimitz encounter in November 2004, which engagement was witnessed eyes-on by Lieutenant Commander Alex Dietrich. The engagement was tracked live by sensor arrays on multiple Navy ships.