Invader

Invader is a 1992 direct-to-video science fiction film by Philip J. Cook, starring Hans Bachmann, A. Thomas Smith and Rick Foucheux. It is the story of a journalist who uncovers an extraterrestrial entity taking over an air force base in Washington, D.C., and must foil its plans of world domination.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.