Documented sightings reported in International, sorted from most recent.
Three NASA astronauts aboard Skylab 3 observed and photographed a bright red rotating object from orbit for over 10 minutes, with NORAD unable to identify any known object in the vicinity.
During NATO's first major maritime exercise, US, UK, Danish, and other allied crews logged multiple radar+visual UFO sightings across the North Sea - one of the earliest multinational military UAP clusters.