A report from the Office of Unidentified Aerial Phenomena (UAP) indicated that the U.S. Department of Defense found no evidence that Earth has been visited by extraterrestrial beings from other planets. The document summarized all official investigations related to unidentified flying objects (UFOs) conducted in the United States, as well as the contents of relevant classified and unclassified government archives. The agency's report stated: "All investigations conducted at all levels of classification revealed that the majority of UFO sightings involved commonplace objects and phenomena, and were also due to misidentification." The Pentagon also denied statements made by former U.S. intelligence official David Grusch, who claimed that the authorities have been concealing a UFO program for decades.