Project Blue Book is closed

On December 17, 1969, Secretary of the Air Force Robert Seamans announced the termination of Project Blue Book, citing the Condon Report, its endorsement by the National Academy of Sciences and earlier UFO studies. The program formally ended on January 30, 1970, closing the most extensive official investigation into unidentified flying objects ever conducted by a national government; its files later went to the National Archives.

The program operated continuously since 1952, succeeding Projects Sign and Grudge, and accumulated a database of 12,618 individual sighting reports from military personnel, airline pilots, and civilian observers.

Background

Project Blue Book ran for over seventeen years, collecting reports from across the country.

• Successor to Projects Sign and Grudge
• Started in 1952
• Total sightings: 12,618

Reason for Termination

The closure was prompted by the Condon Committee report of 1968.

This University of Colorado study, commissioned by the Air Force and led by physicist Edward Condon, concluded that continued scientific investigation of aerial anomalies was unlikely to yield meaningful advances in knowledge.

Unidentified Cases

Of the compiled reports, approximately 701 cases ( 5.5 percent ) remained categorized as genuinely unidentified.

Critics argued this figure warranted continued rather than discontinued study.

Leadership

Blue Book was led by a succession of Air Force officers.

• Captain Edward Ruppelt: Coined the term 'unidentified flying object'
• Major Hector Quintanilla

Its most prominent scientific adviser was astronomer J. Allen Hynek, who initially approached the subject as a skeptic but gradually concluded that a genuine unexplained residue existed within the data.

Hynek's Reaction

J. Allen Hynek publicly criticized the Condon Report: pivotal cases had been ignored, and 30 percent of the cases it examined remained unexplained even by the report's own account, despite its verdict that there was nothing to the subject. Hynek began building his own research track in parallel.

Aftermath

After termination, the Air Force maintained that no investigated sighting had posed a national security concern or demonstrated capabilities exceeding contemporary technology.

This position remained largely unchanged until the Pentagon's acknowledgment of AATIP nearly five decades later.

The closure of Project Blue Book left the United States without an acknowledged official UFO investigation program for nearly fifty years, creating an institutional vacuum that persisted until the revelation of AATIP in 2017 and the subsequent establishment of AARO in 2022.