"We have tackled many strange stories on 60 Minutes, but perhaps none like this," CBS News correspondent Bill Whitaker said on Sunday night's special, which investigated sightings of “unidentified aerial phenomena,” or UAPs, commonly known as UFOs. 

The special focused on publicly released footage of UFOs recorded by Navy pilots, interviewed eyewitnesses, and delved into U.S. government efforts to uncover the truth behind the phenomenon.

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