Mystery AtlasProject Sign
The US Air Force's first formal UFO investigation (1947-1949), prompted by the Kenneth Arnold sighting and the Roswell announcement, succeeded via the intermediate Project Grudge by Project Blue Book.
This is a knowledge-graph entry: what our data records about Project Sign and how it connects to the rest of the atlas. It does not have a full article of its own yet.
Connected to
How this topic links to the people, places, and ideas around it — drawn from our knowledge graph.
People
Project Sign is associated with J. Allen Hynek.
Organisations & Programmes
Project Sign was operated by United States Air Force.
Project Sign preceded Project Blue Book — Via the intermediate Project Grudge (1949-1951).
Explored on these pages
What Was Project Blue Book?
What Project Blue Book was: the US Air Force's 1952-1969 UFO study, its 12,618 cases, why it closed, and what the unexplained 701 still mean.
Why Does the US Air Force Appear in So Many UFO Conspiracy Theories?
Why the US Air Force appears in so many UFO theories: its dual role running both the classified aircraft and the official investigations meant to explain them.