The files the Trump administration has ordered officials to locate and release include records of UFOs and other unidentified phenomena seen in the sky, including cases the government has been unable to explain. The material is expected to be added to an archive in batches, once it has been found and cleared for release. The search covers records created over several decades, some of which exist only on paper [1].
One example already released is a Pentagon document about a black, triangular object spotted over a sensitive military site in the western United States. According to two anonymous witnesses, the object hovered for about 20 seconds, then vanished without a sound. The document neither identified the object nor offered an explanation, and the location was redacted [3]. The account records a sighting; it is not proof that the object was an extraterrestrial craft.
The releases and discussion of the files do not, by themselves, indicate that aliens have been discovered. Avi Loeb has argued that the new files lack crucial data [2], and the document about the triangular sighting does not say what was seen [3]. What is known is that the files concern unresolved sightings. What remains unknown is what the full collection will contain, which cases will appear in each release, and whether any of the sightings will receive a convincing explanation [1][3].