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The large balloons, if caught in jet streams, may assume a near horizontal position when partially inflated, and move with speeds of over 200 MPH. Large types may be observed flattened on top. The effect of the latter two conditions can be startling even to ex- perienced pilots. Many modern aircraft, particularly swept and delta wing types, under adverse weather and sighting conditions are reported as unusual objects and 'flying saucers. When observed at high alti- tudes, reflecting sunlight off their surfaces, or when only their jet exhausts are visible at night, aircraft can have appearances ranging from disc to rocket in shape. Single jet bombers having multi-jet pods under their swept-back wings have been reported as UFOs or "saucers" in UV" formation. Vapor trails will often appear to glow with fiery red or orange streaks when reflecting sunlight. Afterburners are frequently reported as UFOs. The astronomical category includes bright stars, planets, meteors, comets, and other celestial bodies. When observed through haze, light fog, or moving clouds, the planets Venus, Mars, and Supiter have often been reported as unconventional, moving objects. Attempts to observe astronomical bodies through hand-held binocu- lars under adverse sky conditions has been a source of many UFO reports. The "other" category includes reflections, searchlights, birds, kites, blimps, clouds, sun-dogs, spurious radar indications, hoaxes, firework displays, flares, fireballs, ice crystals, bolides, etc., as examples: Large Canadian geese flying low over a city at night, with street lights reflecting off their bodies; searchlights playing on scattered clouds, appearing as moving disc-like shapes. The insufficient data category include all sightings where essential or pertinent items of information are missing, making it impossible to form a valid conclusion. These include description of the size, shape or color of the object; direction and altitude; exact time and location; wind weather conditions, etc. This cate- gory is not used as a convenient way to get rid of what might be re- ferred to as "unknowns". However, if the data received is insuf- ficient or unrelated, the analysts must then place that particular report in this category. The Air Force needs complete information to reach a valid conclusion. Air Force officials stressed the fact that an observer should send a complete report of a bona fide sight- ing to the nearest Air Force activity. There the report will be promptly forwarded to the proper office for analysis and evaluation. A sighting is considered as "unknown" when a report contains all pertinent data necessary to normally suggest at least one valid hypothesis on the cause or explanation of the sighting but when the description of the object and its maneuvers cannot be correlated with any known object or phenomenon. In its Project Blue Book Special Report $14, released in October, 1955, the Air Force showed that evaluated sightings in the "unknown" category had been reduced to 3% at that time. - 2 - MORE

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This file contains correspondence between Senator John F. Kennedy and his constituents regarding flying saucers, or unidentified flying objects (UFOs). It also includes a United States Air Force press release on the study of unidentified flying objects.

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    "ocrText": "The large balloons, if caught in jet streams, may assume a near\nhorizontal position when partially inflated, and move with speeds of\nover 200 MPH. Large types may be observed flattened on top. The\neffect of the latter two conditions can be startling even to ex-\nperienced pilots.\nMany modern aircraft, particularly swept and delta wing types,\nunder adverse weather and sighting conditions are reported as\nunusual objects and 'flying saucers. When observed at high alti-\ntudes, reflecting sunlight off their surfaces, or when only their\njet exhausts are visible at night, aircraft can have appearances\nranging from disc to rocket in shape. Single jet bombers having\nmulti-jet pods under their swept-back wings have been reported as\nUFOs or \"saucers\" in UV\" formation. Vapor trails will often appear\nto glow with fiery red or orange streaks when reflecting sunlight.\nAfterburners are frequently reported as UFOs.\nThe astronomical category includes bright stars, planets,\nmeteors, comets, and other celestial bodies. When observed through\nhaze, light fog, or moving clouds, the planets Venus, Mars, and\nSupiter have often been reported as unconventional, moving objects.\nAttempts to observe astronomical bodies through hand-held binocu-\nlars under adverse sky conditions has been a source of many UFO\nreports.\nThe \"other\" category includes reflections, searchlights, birds,\nkites, blimps, clouds, sun-dogs, spurious radar indications,\nhoaxes, firework displays, flares, fireballs, ice crystals, bolides,\netc., as examples: Large Canadian geese flying low over a city at\nnight, with street lights reflecting off their bodies; searchlights\nplaying on scattered clouds, appearing as moving disc-like shapes.\nThe insufficient data category include all sightings where\nessential or pertinent items of information are missing, making it\nimpossible to form a valid conclusion. These include description\nof the size, shape or color of the object; direction and altitude;\nexact time and location; wind weather conditions, etc. This cate-\ngory is not used as a convenient way to get rid of what might be re-\nferred to as \"unknowns\". However, if the data received is insuf-\nficient or unrelated, the analysts must then place that particular\nreport in this category. The Air Force needs complete information\nto reach a valid conclusion. Air Force officials stressed the fact\nthat an observer should send a complete report of a bona fide sight-\ning to the nearest Air Force activity. There the report will be\npromptly forwarded to the proper office for analysis and evaluation.\nA sighting is considered as \"unknown\" when a report contains\nall pertinent data necessary to normally suggest at least one valid\nhypothesis on the cause or explanation of the sighting but when the\ndescription of the object and its maneuvers cannot be correlated\nwith any known object or phenomenon. In its Project Blue Book\nSpecial Report $14, released in October, 1955, the Air Force showed\nthat evaluated sightings in the \"unknown\" category had been reduced\nto 3% at that time.\n- 2 -\nMORE"
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