Who is retired Army Colonel Karl Nell? And why is no one is talking about the statement he made on the record about his subordinate Dave Grusch’s whistleblower claims? Who is retired Army Colonel Karl Nell? And why is no one is talking about the statement he made on the record about his subordinate Dave Grusch’s whistleblower claims? Who is he, what has he said, and why his statement is the closest thing to a smoking gun ever seen on the UFO/UAP topic.