A US F-15 was shot down over Iran after the pilot reported an unprecedented jellyfish-like formation of Iranian drones moving together in unison.US intelligence officials say the description has spurred debate over whether Iran has deployed one-to-many meshed networking possibly aided by China and Russia.The jet’s two crew ejected and were recovered after a complex rescue that used about 155 aircraft and special forces units across multiple services.Investigators caution the pilot’s perception may reflect unfamiliar technology, optical illusion or stress and have not concluded precisely how the F-15 was downed.