My old man has over 5000 flight hours, 2000 in combat from Vietnam
. He said he had some ball of light doing moves a couple hundred yards off his starboard wing for an hour heading to the states over the Atlantic. He was in a KC 130 Hercules, so there was a crew of half a dozen or so; he was the pilot. Everyone saw it.
They didn't make an official report because apparently it's a pretty quick way to nose dive your military flight career is to start reporting seeing UFO's; you're just not taken very seriously, regardless of your skill. Probably like having a tatoo in a business meeting 20 years ago.