title: NASA reentry prototypes
text: # NASA reentry prototypes
  
  NASA reentry prototypes were a series of atmospheric reentry prototypes built by NASA and experimented in a series of top secret projects between the 1940s and 1960s. These prototypes were capable of self propulsion and guided landings. They were deployed by a series of high altitude balloons of the United States Air Force from an altitude of 170,000 feet (52,000 m).
  
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