While not a conclusion, the reports of objects that defy the known laws of physics are extensive by this point.
If the incidents are not the result of "alien activity" perhaps the US Military does have supremely advanced technology under wraps and is demonstrating this technology to ambiguously create the idea that it could be "aliens".
If the incidents are not the result of "alien activity" perhaps the US Military does have supremely advanced technology under wraps and is demonstrating this technology to ambiguously create the idea that it could be "aliens".