June 29, 1952; O'Hare Airport, Chicago, Illinois. (BBU 1364)

5:45-6:30 p.m. (CDT). 3 USAF air policemen, 83rd Air Base Sq, Air Police Detachment, S/Sgt. Lopez,  A/1c Weber, and A/3c Korkowski, saw a bright silver, smooth surfaced, flat oval 30 ft object at about 500 to­1,000 ft height about 2-3 miles away reflecting sunlight surrounded by a blue circle of haze for the first 20-25 mins, hovering, appeared between radio towers for stations WGN and WBBN 7 miles away [at 42° 0' 42" N, 88° 2' 7" W, and 41° 59' 32" N, 88° 1'6" W] to the WSW at about 2° elevation and to the left and S of the setting sun (which was at 284° azimuth 20° elevation at 6:30), then move very fast to the right and left, and up and down relative to the radio towers, moving almost instantaneously and much faster than any jet fighter. Object rocked on its longitudinal axis, appeared oval (major/minor axis ratio about 2.2) when oriented vertically, thin and difficult to see when horizontal. Object receded at high speed then disappeared like shutting off a light. No trail, no noise. Independently witnessed by Chicago firemen several miles away. (Jan Aldrich; unpublished Ruppelt manuscript).

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