William Neil McCasland disappeared just one week after President Trump ordered the immediate release of the government's so-called alien files.

William Neil McCasland was a former commander of the Air Force Research Laboratory, responsible for advanced military technology and science.

The release of UFO files is part of President Trump's effort to increase transparency on government knowledge of possible extraterrestrial activity.

Retired Major General William Neil McCasland vanished from his Albuquerque home in February 2026.