The Secret History of Minnesota Part 1: Engineering Research Associates
Steve Blank
DECEMBER 11, 2023
The Navy’s was called CSAW ( Communications Supplemental Activity Washington ) also known as OPS-20-G. The Army codebreaking group was the Signal Intelligence Service (SIS) at Arlington Hall. The Army focused on decrypting (breaking/decoding) Japan’s diplomatic and Army codes while the Navy worked on breaking Japan’s Naval codes.
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