WASHINGTON — A top Pentagon official has attacked this week’s widely watched congressional hearing on UFOs, calling the claims “insulting” to employees who are investigating sightings and accusing a key witness of not cooperating with the official U.S. government investigation.

       Dr. Sean Kirkpatrick’s letter, published on his personal LinkedIn page and circulated Friday across social media, criticizes much of the testimony from a retired Air Force intelligence officer that energized believers in extraterrestrial life and produced headlines around the world.

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       Retired Air Force Maj. David Grusch testified Wednesday that the U.S. has concealed what he called a “multi-decade” program to collect and reverse-engineer “UAPs,” or unidentified aerial phenomena, the official government term for UFOs.