Project Blue Book Case #36. On July 6, 1947, an unidentified object was observed at Fairfield-Suisun Air Force Base in California — just twelve days after Kenneth Arnold's landmark sighting. As Case #36, this was among the very earliest entries in what would become the Blue Book archive, and the third unknown from this base across the years (joining Cases #257 from 1948 and #1920 from 1952).
July 6, 1947, was during the peak of the original wave that launched the modern UFO era. Reports were flooding in from across the country, and the military was scrambling to understand what was happening. Fairfield-Suisun — the Army Air Forces' primary Pacific transport hub — was one of the busiest military airfields on the West Coast.
The base's contribution of an unknown during the very first wave, followed by repeat unknowns in 1948 and 1952, made it one of the most persistently visited locations in the entire Blue Book database. Whether this reflected the base's heavy traffic, its experienced observers, or a genuine affinity of the phenomenon for this location, the pattern was striking.
The case was classified "Unknown" — one of the founding entries in America's official UFO record.