Osan Air Force Base Korea reported changing shape observation — September 18, 1961

Ground noise, and passage of a sound source could be observed. Insufficient information to arrive at a positive conclusion as to the nature of the phenomenon observed. OBJECTIVE OF THIS EXTRACT OF THIS SIGHTING IS TO ASCERTAIN IF THE OBJECT OBSERVED COULD HAVE BEEN ONE OF THE KNOWN CONVENTIONAL AIR CRAFT/SATELLITES OR NATURAL PHENOMENA WHICH COULD HAVE PRODUCED THE REPORT AND RELATED PHENOMENA REPORTED BY THE OBSERVER. ACCORDING TO THE SIGHTING REPORT, THE OBJECT WAS OBSERVED DURING THE DAY AND NIGHT HOURS. FURTHER INFORMATION INDICATES THAT THE OBJECT WAS INITIALLY OBSERVED AS A BRIGHT CIRCULAR OBJECT WHICH LATER BECAME SMALLER AND CHANGED SHAPE. THE OBJECT WAS REPORTED TO HAVE MADE RAPID CHANGES IN ALTITUDE AND SPEED. OBJECT IN THE NIGHT WAS OBSERVED TO EMIT BEAMS OF LIGHT. OTHER REPORTED PHENOMENA INCLUDED RADIO INTERFERENCE AND MAGNETIC DISTURBANCES. THE REPORTED CHARACTERISTICS OF THE OBJECT AND THE ASSOCIATED PHENOMENA DO NOT MATCH ANY KNOWN CONVENTIONAL EXPLANATIONS. TC WAS INFORMED OF SIGHTING OF UNIDENTIFIED FLYING OBJECT BY PERSONNEL AT OSAN AFB, KOREA. ON THE EVENING OF 8 SEPTEMBER 1961, AT APPROXIMATELY MILITARY TIME, 2030 HOURS, THE FOLLOWING PERSONNEL REPORTED SIGHTING OF UNIDENTIFIED FLYING OBJECT: 1. AIRMAN 1ST CLASS THEY REPORTED THE FOLLOWING: THE OBJECT WAS FIRST OBSERVED APPROXIMATELY 20 DEGREES ABOVE THE HORIZON AND APPROXIMATELY 15 DEGREES WEST OF NORTH.