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Professor Glaser warns of saturation of interchangeable indicators with further indicators which only serves to confuse the audience, it is also a very old realization through NSA back to Petronius Arbiter, yes in service to Nero. When instructing, oral traditions are very sensitive to this.
We trained hard-but it seemed that every time we were beginning to form into teams, we would be reorganized. I was to learn later in life that we tend to meet any new situation by reorganizing; and what a wonderful method it can be for creating the illusion of progress while producing confusion, inefficiency and demoralization.
Petronius Arbiter
From Cryptolog JAN-MAR 1981
National Security Agency, USA