The Secret History of Minnesota Part 1: Engineering Research Associates
Steve Blank
DECEMBER 11, 2023
The Army codebreaking group was the Signal Intelligence Service (SIS) at Arlington Hall. During World War II the demands of war industries caused millions more Americans to move to where most defense plants located. The Navy’s was called CSAW ( Communications Supplemental Activity Washington ) also known as OPS-20-G. A year later, 420.
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