More historical detail is available on the CIA-financed Hughes 500P "Quiet One" prototype, used for a spying mission into North Vietnam on the night of December 5-6, 1972. That article, "Air America's Black Helicopter," appeared in the February 2008 issue of Air&Space/Smithsonian magazine. Click this link for the story. More helicopter articles are listed in the "About the Author" link.
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