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Avi Loeb on the 1952 audio recording by Captain Edward J. Ruppelt: "these objects were moving up to five times the speed of sound, but not making any sound"

Friday's drop included an audio recording and transcript of a Project Blue Book presentation given in March 1952 by Capt. Edward J. Ruppelt. "What was most puzzling based on the new information is that these objects were moving up to five times the speed of sound, but not making any sound," Loeb told "NewsNation Prime."