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ton, advised on August 22, 1972, that Langley Air Force Base, Virginia, tele- P would ‘be able to provide expert information concerning the feasibility of using high resolution infrared or regular photographic equipment in a low flying aircraft to locate the attache case or any other of the above-described items Unsub may have discarded prior to jumping. The items could possibly be lodged in thickly wooded, mountainous terrain. The search area would cover -a strip of land approximately 87 miles long by one-half. Mile wide. It has been suggested that infrared photography might possibly indicate non-living material, such as an attache case, in a darker shade than living material, thereby enabling the case to be found using infrared high resolution photography. ! Since Unsub possibly discarded the attache case prior to ‘jumping, he could not have buried or hidden it. The case would have dropped directly in the flight path of the plane and could possibly be visible from the air. The Xength of time Unsub ‘would have to throw the case or any other item is limited to 33 minutes, and therefore the area covered is relatively small when. compared to the entire flight path. Since NORJAX is the.only aircraft hijacking in which the subject has not been identified and apprehended nor the ransom money recovered, the following lead is being set forth as a method of possibly obtaining new evidence that might identify Unsub or indicate his whereabouts: LEAD NORFOLK AT LANGLEY AIR FORCE BASE, VIRGINIA. Will expeditiously contact | Jand determine from him the feasibility and cost of conducting the above-desoribed photographic air search. ARMED AND DANGEROUS . a] DB Cooper-9861 b7C