This was the record of all message traffic into and out of Nimitz's HQ in Honolulu as well as a record of all discussions and decisions resulting from said traffic. It remained secret until 1972 and after that and available only by visiting the Naval History HQ. Only much later money was donated to digitize these records.
As a piece of memorabilia, participants received a flash drive with the Graybook's contents from 7 December 1941 to 31 August 1942.
While focused on strategic rather than tactical or technical issues and never referring directly to station Hypo (Nimitz's crypto unit) the Graybook gives one insights into both Nimitz's thought process as well as the external pressures he was under from King above him and from his "allies" especially Macarthur. I learned a lot about Nimitz's leadership style and his steady hand on the wheel during a very trying period.
If anyone wants the full record you can obtain it from the Naval History Branch. However, if anyone would like to have just the portion I received as a pdf, email me at firstname.lastname@example.org and I will send you a copy.
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