Project Blue Book Special Report No 14
AI Summary
Project Blue Book Special Report No. 14 analyzes reports of unidentified aerial objects (UAPs) received by the U.S. Air Force from 1947 to 1952. The report concludes that while many sightings remain unexplained, the majority can be attributed to known phenomena, and the likelihood of UAPs representing advanced technology is low.
Key Findings
- Reports of UAPs have been received since 1947, with no evidence of a threat to U.S. security. - A total of 4,834 reports were evaluated, with 3,201 cases used for statistical analysis. - The majority of sightings were identified as balloons (16%), aircraft (20%), astronomical phenomena (25%), or insufficient information (17%). - The percentage of unexplained cases decreased significantly with improved reporting and investigation methods. - Statistical analysis indicated a low probability that UAPs represent unknown technological developments.
OCR Text
----~.~..:_:._~,. / FORM 2250 Approved fo..r: Release 2026 Under Section 1842 of the National Defen~5.e ,..,_ _.,-<,y-; ~ ----<-4H~ 6 64 1 • Authorizati6n Ac-e' for Fiscal Year 2024 ~ 5'f.J _: ~-_,.,/ 1 (PLACE FORM qgo HERE) 0 FFI C/IAL J RECORD The, Agenc. in accc. additior, Records .,.---------- RETURN IMMEDIATELY AFTER USE TO THE CIA ARCHIVES AND RECORDS CENTER 6-64 FORM 2250 (PLACE FORM ~90 HERE} OFFICIAL J RECORD COPY WARNING The attached document (s) must be safeguarded. It is the Agency's Official Historical Record and must be preserved in accordance with the Federal Records Act of 1950. For additional information, call the Chief, CIA Archives and Records Center, extension 2468. RETURN IMMEDIATELY AFTER USE TO THE CIA ARCHIVES AND RECORDS CENTER SJ -:/). ,1/i . . . r ..~.. ,=,. _._,_-. :~ ·, ••,;-.,-·, C / , ' \ .-_.," _ :.---_J: -~,,,, , -,_1: ... ~ -~-·~f·;•";,_,, ;: ~;..::;s.-..:.--:;_1-:,:,,•-'l(<..., --... ~·-....... --..._,,,!,.,,,,.,._ I - ~ ~-I /) ,._;· C'.'.:'.: ?'e·--·('· ·~,--~~lt!L j ,.,.. # ·, •·•21u,c< .."""- 1 d'" ;I 'PROJECT BLLI ' B • ti?0 1---7 I '/~ I SPECIAL REPORT N0.14 II I (ANALYSIS OF REPORTS OF UNIDENTIFIED AERIAL OB1ECTS) I I PROJECT NO. 10073 I I 5 MAY 1955 I \ I I I .I AIR TECHNICAL INTELLIGENCE CENTER I WRIGHT-PATTERSON AIR FORCE BASE I OHIO I I Copy No. 35 --=---- ,, l PROJECT BLUE BOOK \I SPECIAL REPORT NO. 14 ii ' (ANALYSIS OF REPORTS OF UNIDENTIFIED AERIAL OBJECTS) il 1 I I I PROJECT NO. 10073 I :1 5 MAY 1955 I 1 11 ! ii FOR OffIC!Al USt ONlY (AFR 190-16) I :I !1 I I AIR TECHNICAL INTELLIGENCE GENTER I WRIGHT-PATTERSON AIR FORCE BASE o:mo I I No copyright materiel ls contained In this publication, _I I I TABLE OF CONTENTS I SUMMARY. vii I INTRODUCTION ORIGIN AND NATURE OF DATA 3 I REDUCTION OF DATA TO MECHANIZED COMPUTATION FORM 4 I Questionnaire . 4 Coding System and Work Sheet 6 Identification of Working Papers. 7 Evaluation of Individual Reports 10 I ANALYSIS OF THE DATA. 14 I Frequency and Percentage Distributions by Characteristics 14 Graphical Presentation . 16 Advanced Study of the Data 16 Position of the Sun Relative to the Observer 16 Statistical Chi Square Test 60 The "Flying Saucer" Model 76 I CONCLUSIONS 94 I APPENDIX A. TABULATION OF FREQUENCY AND PERCENTAGE DISTRIBUTIONS BY CHARACTERISTICS 95 APPENDIX B. WORKING PAPER FORMS 255 Figure l I Figure 2 I Figure 3 I Figure 4 Figure 5 I Figure 6 Figure 7 I Figure 8 I Figure 9 I Figure 10 I Figure 11 Figure 12 I Figure 13 I I LIST OF ILLUSTRATIONS Frequency of Sightings by Year for Object, Unit, and All Sightings 17 Distribution of Evaluations of Object, Unit, and All Sightings for All Years 18 Distribution of Object Sightings by Evaluation for All Years With Comparisons of Each Year for Each Evaluation Group • 19 Distribution of Object Sightings by Evaluation for All Years and Each Year 20 Distribution of Object Sightings by Evaluation Within Months for All Years 21 Distribution of Object Sightings by Certain and Doubtful Evaluations for All Years and Each Year • 22 Frequency of Object Sightings and Unknown Object Evaluations by Months, 1947-1952. 23 Distribution of Object Sightings by Sighting Reliability Groups With Evaluation Distributions for Each Group . 24 Distribution of Object Sightings Among the Four Sighting Reliability Groups for All Years and Each Year . 25 Distribution of All Sightings by Sighting Reliability Groups, Segregated by Military and Civilian Observers, With Evaluation Distribution for Each Segregation 26 Distribution of Object Sightings by Reported Colors of Object(s) With Evaluation Distribution for Each Color Group • 27 Distribution of Object Sightings by Number of Objects Seen per Sighting With Evaluation Distribution for Each Group 28 Distribution of Object Sightings by Duration of Sighting With Evaluation Distribution for Each Duration Group . 29 iii I I I LIST OF ILLUSTRATIONS (Continued) Figure 14 Distribution of Object Sightings by Months Among the Eight Duration Groups for All Years Figure 15 Distribution of Object Sightings by Shape of Object(s) Reported With Evaluation Distribution for Each Shape Group , Figure 16 Distribution of Object Sightings by Reported Speed of Object(s) With Evaluation Distribution for Each Speed Group . Figure 17 Distribution of All Sightings by Observer Location for All Years and Each Year Figure 18 Comparison of Known and Unknown Object Sightings by Color, 1947-1952 Figure 19 Comparison of Known and Unknown Object Sightings by Number of Objects per Sighting, 1947-1952 Figure 20 Comparison of Known and Unknown Object Sightings by Speed, 1947-1952 Figure 21 Comparison of Known and Unknown Object Sightings by Duration, 1947-1952 Figure 22 Comparison of Known and Unknown Object Sightings by Shape, 1947-1952 Figure 23 Comparison of Kn…
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