Aeroflot medicine was not a UFO case

This is a 1976 CIA foreign intelligence report on Soviet Aeroflot aerospace medicine, in which a radiation biologist explains pilots' in-flight 'flashes of light' as cosmic ray particles hitting the eye, and relays a claim that 99 percent of UFO events traced back to natural or man-made causes. It is a reminder that flashes of light can come from the body and surroundings rather than an outside craft. It links UFO-adjacent records to the limits of human perception under unusual flight conditions.

open the original, on war.gov ↗