This book and its message could not be more relevant today. After World War II, the U.S. Intelligence Community's main objective was to understand the intentions and capabilities of the Communist threat. This meant a focus on the Soviet Union and its allies. Data on the number and capabilities of tanks, airplanes or ships in the inventory of the Warsaw Pact were not easy to come by, although somewhat easier to obtain than insight into the intentions of Communist leaders. A well-placed spy or satellite with a camera could yield some information but far from the whole picture. One of the most...