Key RV Case
July 29, 1952
Captain Edward J. Ruppelt:
In the Haneda Incident, according to the sketch of the UFO's track, each turn the UFO made was constant and the straight "legs" between the turns were about the same length. The sketch of the UFO's flight path as it moved back and forth over Tokyo Bay reminded me very much of the "crisscross" search patterns we used to fly during World War II when we were searching for the crew of a ditched airplane. The only time the UFO seriously deviated from this pattern was when the F-94 got on its tail.
The Michigan sighting was even better, however. In this case there was a definite reason for every move that the UFO made. It made a 180 degree turn because the F-94 was closing on it head on. It alternately increased and decreased its speed, but every time it did this it was because the F-94 was closing in and it evidently put on speed to pull out ahead far enough to get out of range of the F-94's radar. To say that this motion was random and that it was just a coincidence that the UFO made the 180 degree turn when the F-94 closed in head on and that it was just a coincidence that the UFO speeded up every time the F-94 began to get within radar range is pushing the chance of coincidence pretty hard.
The idea of the motion analysis study sounded interesting to me, but we were so busy on Project Blue Book we didn't have time to do it.
Source: The Report on Unidentified Flying Objects, 191