Historical Archive1947-1969

Project Blue Book - Unidentified Cases

Project Blue Book (1952-1969) was the U.S. Air Force's official UFO investigation program, investigating 12,618 reported sightings. Of these, 701 were officially classified "Unidentified" at program closure. The 558 cases below represent NICAP's independently verified subset - cases where the Unidentified classification holds under conservative review standards.

View Program Overview|Primary Source (NICAP)

Project Blue Book Unidentified Cases - 558 cases verified as "Unidentified" by NICAP independent review (1947-1969). 558 cases verified as 'Unidentified' by NICAP independent review. Official USAF count: 701. Discrepancy reflects NICAP's more conservative verification standard.

Source: NICAP Blue Book Unknowns Compilation Enriched: Brad Sparks Comprehensive Catalog of Blue Book Unknowns (CUFOS, 2020)

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Showing 558 of 558 cases

Case	Date	Location	Duration	Region	Status
#12	June 24, 1947	Portland, Oregoninstr.	-	USA	Unkn.
#27	July 3, 1947	South Brookville, Maine	-	USA	Unkn.
#34	July 4, 1947	Emmett, Idaho	105 min	USA	Unkn.
#36	July 6, 1947	Fairfield-Suisan AFB, California	1 min	USA	Unkn.
#50	July 8, 1947	Muroc AFB, California	4 min	USA	Unkn.
#69	July 29, 1947	Hamilton Field, California	-	USA	Unkn.
#85	September 3, 1947	Oswego, Oregon	-	USA	Unkn.
#91	October 1947	Dodgeville, Wisconsin	1 hr	USA	Unkn.
#95	October 14, 1947	Phoenix. Arizona	-	USA	Unkn.
#139	April 5, 1948	Holloman AFB, New Mexicoinstr.	30 sec	Mexico	Unkn.
#185	July 29, 1948	Indianapolis, Indiana	15 sec	India	Unkn.
#190	July 31, 1948	Indianapolis, Indiana	10 sec	India	Unkn.
#191	July-August 1948	Marion, Virginia	-	USA	Unkn.
#208	September 23, 1948	San Pablo, California	-	USA	Unkn.
#218	October 15, 1948	Kyushu, Japaninstr.	10 min	Japan/Pacific	Unkn.
#257	December 3, 1948	Fairfield-Suisan AFB, California	25 sec	USA	Unkn.
#275	January 4, 1949	Hickam Field Hawaii	-	USA	Unkn.
#284	January 27, 1949	Cortex, Floridainstr.	-	USA	Unkn.
#319	March 17-18, 1949	Killeen Base, Camp Hood, Texasinstr.	-	USA	Unkn.
#358	April 24, 1949	Arrey, New Mexicoinstr.	50 sec	Mexico	Unkn.
#361	April 28, 1949	Tucson, Arizonainstr.	-	USA	Unkn.
#376	May 5, 1949	Fort Bliss, Texas	2 sec	USA	Unkn.
#379	May 6, 1949	Livermore, California	5 min	USA	Unkn.
#384	May 9, 1949	Tucson, Arizonainstr.	10 sec	USA	Unkn.
#404	May 27, 1949	Southern, Oregon	5 min	USA	Unkn.
#483	July 24, 1949	Mountain Home, Idahoinstr.	9 min	USA	Unkn.
#496	July 30, 1949	Mount Hood, Oregon	-	USA	Unkn.
#642	February 24, 1950	Albuquerque, New Mexicoinstr.	1.5 min	Mexico	Unkn.
#645	February 25, 1950	Los Alamos, New Mexicoinstr.	3 sec	Mexico	Unkn.
#650	March 3, 1950	Selfridge AFB, Michigan	15 min	USA	Unkn.
#671	March 20, 1950	Stuttgart, Arkansas	9 sec	USA	Unkn.
#678	March 27, 1950	Motobu, Okinawainstr.	12 min	Japan/Pacific	Unkn.
#680	March 28, 1950	Santiago, Chileinstr.	10 sec	Chile	Unkn.
#682	March 29, 1950	Marrowhode Lake, Tennessee	-	USA	Unkn.
#706	April 8, 1950	Kokomo, Indiana	2 min	India	Unkn.
#711	April 14, 1950	Fort Monmouth, New Jersey	4 min	USA	Unkn.
#721	May 7, 1950	East Ely, Nevada	10 min	USA	Unkn.
#738	June 27, 1950	Texarkana, Texas	5 sec	USA	Unkn.
#758	July 13, 1950	Redstone Arsenal, Georgia	30 sec	USA	Unkn.
#773	August 4, 1950	North Atlantic	15 sec	International Waters	Unkn.
#793	August 20, 1950	Nicosia, Cyprus	3 sec	Cyprus	Unkn.
#787	August 24, 1950	Air radar, Bermudainstr.	20 min	International Waters	Unkn.
#790	August 30, 1950	Sandy Point, Newfoundlandinstr.	20 min	USA	Unkn.
#797	September 3, 1950	Spokane, Washington	5 min	USA	Unkn.
#807	September 20, 1950	Kit Carson, Colorado	1 min	USA	Unkn.
#809	September 21, 1950	Provincetown, Massachusettsinstr.	2 min	USA	Unkn.
#819	October 15, 1950	Knoxville, Tennesseeinstr.	30 sec	USA	Unkn.
#821	October 15, 1950	Pope AFB, North Carolina	3 min	USA	Unkn.
#824	October 23, 1950	Bonlee, North Carolina	40 sec	USA	Unkn.
#829	November 5, 1950	Oak Ridge, Tennesseeinstr.	-	USA	Unkn.

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