If done now it would be a 200 page FRAGO.
It was done in the days when every message like that had to be hand encrypted and decrypted and sometimes those could pile up for days because the one or two people on the ships doing the decryption had to sleep. I was taught to keep the damned things brief, terse, as few words as possible, no negligent embellishment, nothing extraneous. The watchword was BRIEF. Pity we lost sight of that today.
I kind of miss the Exile of Portales. He was always first to say,
I know what you did there.Just an annual random tribute to him and Lex and Villainous Company.