The FBI has joined the search for retired Air Force Major General William Neil McCasland, who went missing in Albuquerque, New Mexico, on February 27, 2026. McCasland previously commanded the Air Force Research Laboratory at Wright-Patterson Air Force Base—a site long rumored to house debris from the 1947 Roswell crash. His disappearance has been described by some as a "grave national security crisis" due to his knowledge of classified space programs.