For the last decade, reports of UFO sightings have filled headlines and news broadcasts, and some of these have from a surprising place—the Pentagon. Former defense officials have made a number of claims about, and released videos of, strange sightings made by military pilots.

These days, the objects are officially called “UAPs”—unidentified anomalous phenomena.

But regardless of the new branding, Congress has demanded answers on them, especially after one former official this summer claimed that he believed that the U.S. possessed “nonhuman” spacecraft and possibly their “dead pilots.”

We talk to the former intelligence official and physicist, Sean Kirkpatrick, who until December headed the All-domain Anomaly Resolution Office, the Pentagon office that Congress told to find some answers to all this. He recently published an op-ed in Scientific American called  "Here's What I Learned as the U.S. Government's UFO Hunter".

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