https://www.vice.com/en_us/article/5db55b/pentagon-report-some-ufo-sightings-cant-be-explained-with-current-science

The Pentagon's long-awaited report on UFOs details 143 sightings of aerial objects that cannot be explained. Titled "Preliminary Assessment: Unidentified Aerial Phenomena," the report is a product of the Office of the Director of National Intelligence (DNI). It’s nine pages long and while its findings are “largely inconclusive,” the report states that a small number of cases where UFOs "appeared to display unusual flight characteristics or signature management" can't be explained without "scientific advances that allowed us to better understand them."

To study the phenomenon, the Pentagon formed the Unidentified Aerial Phenomena Task Force (UAPTF) which studied reported sightings between the years of 2004 and 2021.