75 Years of Armstrong: Efficiency 

NASA Armstrong’s Flight research center is honoring 75 years of advancing technology and science through flight.
For the next year there will be monthly reoccurring videos released to help tell the past 75 years of NASA Armstrong. This month’s theme is efficiency! Starting in the 1970’s new advancements were made to make flying more economical and faster. Learn about the history of airplane advancement through flight.
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The majority of archival footage and sound used in this video are in the public domain and can be found in government records, the Internet Archive, or Wikimedia Commons.
Additional Sources Include:
"Forward to Excellence: The Legacy of the X-Series" (1983), Northrop Grumman Corporation
"The Shape of Things to Come" (1984), Northrop Grumman Corporation