The strange objects, one of them like a spinning top moving against the wind, appeared almost daily from the summer of 2014 to March 2015, high in the skies over the East coast. Navy pilots reported to their superiors that the objects had no visible engine or infrared exhaust plumes but that they could reach 30,000 feet and hypersonic speeds.

"These things would be out there all day," said Lt. Ryan Graves, an F/A-18 Super Hornet pilot who has been with the Navy for 10 years and who reported his sightings to the Pentagon and Congress. "Keeping an aircraft in

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