Writer Richard Matheson explained that the title of this episode and its short story referred to both the protagonist's physical journey as well as his departure from cowardice.
Filmed at Norton AFB, San Bernardino, California--playing the roll of Lafayette Air Base, Reims, France. There was a Reims Air Base in France in 1959 (the year this episode was set), now known as Aerodrome de Reims-Champagne. Norton AFB was decommissioned and closed in 1994. The site is now San Bernardino International Airport.
The rank of Air Vice Marshall (AVM) in the R.A.F. is equivalent to the rank of Major General in the U.S.A.F. Therefore, officers Harper and Mackaye are of equal rank.
The helicopter is a Sikorsky H-5 seen both in the hangar and later taking off. First flight August 18, 1943. Retired in 1957. Over 300 were built.