Toward the Unknown

The XB-51 serving as the film's Gilbert XF-120 did not survive the making of the film. While in the process of shooting additional flight footage, the pilot attempted to get the plane to lift without the full thrust required, with the result that the plane prematurely rotated and stalled, crashing at the end of the Edwards runway. The crash killed pilot Major James R. Rudolf and radar officer Staff Sgt. Wilbur R. Savage, and destroyed the only surviving prototype of the plane.

Throughout the film, General Banner's combat ribbons on his uniform keep changing in number. Early in the film he has three rows of combat ribbons. Later, he has five rows, and then three rows again.

Referenced in What's My Line?: June Taylor and Her Dancers & William Holden (1956)