unidentified flying object

Navy officials confirmed the videos' existence last fall while insisting at the time that the footage should never have been made public.
Naval authorities call the objects in the footage "unidentified aerial phenomena."
The briefings reviewed “efforts to understand and identify these threats” to air crew members, a Navy spokesperson said.
Navy pilots in recent years have discussed seeing "strange objects" with no visible engines or exhaust plumes flying up to 30,000 feet in the air.
"The object went higher into the air and started to move pretty fast."
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