Self (as Captain Willis Sperry)
Self
Self - Chief Photographer
Albert M. Chop
Narrator
Dewey Fournet
Editor
Dayton Colonel
Reporter
Mrs. Chop
Captain Edward Ruppelt
Self (archive footage) (as Dr. John A. Sandford)
Scientist
Narrator (voice)
Personnel Official
Self (archive footage) (as Gen. Hoyt Vandenberg)
Pilot on Radio (voice) (uncredited)