THE WAR DEPARTMENT CODE.
As previously stated, the War Department Code is the technical military code and contains expressions numbered consecutively from 1 to 62,000. All the code words are composed of 6 letters, which are so arranged that the vowels and consonants invariably alternate. In the formation of code words the following 13 letters only are used, viz, A, B, D, E, F, G, I, K, M, N, S, U, and X. The body of the code book is arranged as follows:
(a) Army list, containing the name of every commissioned officer in the regular establishment.
(b) Military organizations, giving all batteries, companies, troops, etc.
(c) Military posts and stations, covering Alaska, Hawaii, Philippine Islands, Porto Rico, and the United States.
(d) United States naval stations and vessels.
(e) Geographical names.
(f) Miscellaneous tables as follows:
Numerals.
Arrivals and departures.
Dates.
Indorsements.
Letter acknowledgments.
Requisitions.
Telegram acknowledgments.
Mails, shipments, and transports.
Blanks for future additions as they may be needed.
Ranks and grades of officers and men in the Army.
Wireless stations of the Army and Navy.(g) Alphabetical list of code expressions arranged conveniently for use.
When it is desired to transmit some word or expression not to be found in the code and no suitable synonym can be discovered the word or expression should be sent in plain language or spelled out by the equivalents for letters and endings to be found on page 589.
Complete instructions for the use of the code either as a code or cipher are contained in the introductory pages of the book.