The Pentagon has published the sixth batch of declassified and historical materials on unidentified anomalous phenomena, the U.S. military department reported.

The collection includes documents, audio recordings, and video recordings. Among them are materials on observations of unidentified flying objects (UFOs) in 1952 and documents from the Advanced Aerospace Weapon System Applications Program (AAWSAP), which focused on advanced aerospace technologies.

A total of 71 files were published: 55 text files, 15 videos, and 1 audio file. The data concern events over the past 73 years. Most of the reported encounters with UFOs remain classified as “unexplained.”

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