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by lectrick 3793 days ago
http://www.foia.cia.gov/sites/default/files/document_convers...

Page 3, point 4:

"Sightings of unexplained objects at great altitudes and traveling at high speeds in the vicinity of major U.S. defense installations are of such nature that they are not attributable to natural phenomenon or known types of aerial vehicles."

Also note the National Security Council directive on the last page.