I'm surprised they're continuing the misdirection so many years later. "Unidentified flying object" means an aircraft, usually a military one (because civilian aircraft are easier to identify). A UFO over US soil would usually be a USAF plane, but the CIA ran (runs?) a reporting hotline because they might occasionally be foreign spy planes instead. But of course, the Soviets were very interested (or the US believed t…
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.