humanoidhistory: A Lockheed X-17 three-stage rocket mounted on a display stand. This vehicle had its first launch in 1956. Photo by Hans Groenhoff. (Smithsonian Air &amp; Space Museum)

humanoidhistory: A Lockheed X-17 three-stage rocket mounted on a display stand. This vehicle had its first launch in 1956. Photo by Hans Groenhoff. (Smithsonian Air & Space Museum)

humanoidhistory: A Lockheed X-17 three-stage rocket mounted on a display stand.