On the Threshold of Space is a 1956 Drama directed by Robert D. Webb, starring Guy Madison, Virginia Leith and John Hodiak. Historical depiction on tests done to prepare US for space travel.Much of the plot depicts the testing of downward firing ejection seats from B-47 Stratojet bombers that were conducted at Eglin AFB, Florida, initially between 7 October and 21 October 1953, when nine tests were conducted of the seat from a B-47 over Eglin’s water ranges over the Gulf of Mexico, by the Air Proving Ground, at an altude of 10,000 feet and various speeds. A second series of tests was also conducted beginning 8 July 1954 after refinements to the system. [from Wikipedia] These tests were recreated in the film, shot at Eglin in 1955, with a different Stratojet than the one in the actual missions.