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the same files. They simply emphasized different parts of them. The legacy of Project Blue Book is therefore complicated. It demonstrated that many UFO reports could be explained. It also demonstrated that not every report could be resolved with the information available. Most importantly, it created a huge historical record. Those files allow modern researchers to examine how witnesses described unusual events and how government investigators responded. The technology of the 1950s and 1960s was limited compared with today's world. Investigators did not have the benefit of smartphones, high-resolution digital cameras, civilian satellite imagery or modern data-processing systems. That limitation should be remembered when judging the conclusions of the period. The investigators were working with the tools available to them. Sometimes those tools were sufficient. Sometimes they were not. Project Blue Book eventually became less active and increasingly controversial. By the 1960s, pressure was growing for a more scientific assessment of the UFO question. That would eventually lead to the Condon Committee and, ultimately, the closure of Project Blue Book. But before the project reached its end, one event above all others had already demonstrated how difficult the UFO question had become. The lights over Washington, D.C., had brought the mystery directly to the nation's capital. The following chapter takes us into that extraordinary summer of 1952.