The congressional hearing Tuesday (May 17) that focused on unidentified flying objects (UFOs) has drawn mixed reviews. 

Eagerly awaited by many, it was the first open congressional hearing on UFOs — or UAP ("unidentified aerial phenomena"), as they've recently been rebranded — in more than a half-century. 

Congressman André Carson (D-Ind.), chairman of the House Intelligence Counterterrorism, Counterintelligence, and Counterproliferation Subcommittee, kicked off Tuesday's hearing by noting that, more than 50 years ago, the U.S. government ended Project Blue Book, an effort to catalog and understand sightings of objects in the air that could not be immediately explained. 

"For more than 20 years, that project had treated unidentified anomalies in our airspace as a national security threat to be monitored and investigated," Carson said.

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