A film presentation on the joint efforts of NASA and the US Air Force examining the Lockheed YF-12. Location is Dryden Flight Center and Edwards Air Force Base in California. Background of research of the development of faster aircraft at high altitudes. Some early tests on the YF-12 were conducted at NASA Langley Research Center in the Unitary Tunnel. For more on this facility, see http://crgis.ndc.nasa.gov/historic/1251. See also a related publication: http://crgis.ndc.nasa.gov/historic/File:88796main_YF-12.pdf - Mach 3+: NASA/USAF YF-12 Flight Research, 1969-1979]]. Peter W. Merlin. 2001. Monographs in Aerospace History #25. NASA SP-2001-4525. Color film with audio. Langley Film #L-1297.