after midnight on july 27, usaf major dewey fournet, project blue book's liaison at the pentagon, and lt. john holcomb, a united states navy radar specialist, arrived at the radar center at national airport. during the night, lieutenant holcomb received a call from the washington national weather station. they told him that a slight temperature inversion was present over the city, but holcomb felt that the inversion was not "nearly strong enough to explain the 'good and solid' returns" on the radarscopes. fournet relayed that all those present in the radar room were convinced that the targets were most likely caused by solid metallic objects. there had been weather targets on the scope too, he said, but this was a common occurrence and the controllers "were paying no attention to them." two more f-94s from new castle air force base were scrambled during the night. one pilot saw nothing unusual; the other pilot saw a white light which "vanished" when he moved towards it. additionally, "civilian planes flying into washington reported seeing strange glowing objects in places where the radar was getting blips." as on july 20, the sightings and unknown radar returns ended at sunrise.