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UNITED STATES FLEET 

HEADQUARTERS OF 'rHE COMMANDER IN CHIEF i~AVY DEPARTMEJ\JT, NASHINGTON, D C 

FF1/A6-2 

Se.rial: 00551 March 25, 1943 

SEC11E'f 

From Commander in Chief', United States Fleet, 

and Chief of 1\!aval Operations. Commander in Chief, 1Jnt ted Btatf's Atlantic Fleet. 

Commander in Chief, Jnited States Pacific ?leet. 

ComTander, Seventh Fleet • . All Commanaers of Sea Frontiers. 

All District Commendants. 

Chiefs of All Air Technical, Primary and Intermediate Training. 

SuoJect. Control of lissemination enu use of communication 

intelligence. 

Reference• (a) Cominch Secret serial 0325520 of June ro, 1942. 

l. aererence (a) ls hereby superseded &nu shall be 

uestroyed by ourning. 

~- The extreme importance of communication intelligence 

as a reliable source 0f enemy information has beEn repeatedly uemonstrated. From no other form of intelligence can the enemy's intePtions be so positively determined. 

3. In vtew of these facts 1 it ls 11aper&tlve that every possible ~recaution be ta~en with regard to controlling the u1seem1natlon aud. use of communication intelligence in order to 

avoid urying up its sources. Any disclosures in toe past with 

regard to the source of communication intelligence have invariaoly resulted in an immediate change in the enemy's communications cnu the consequent loss of weeks or months of painstaking Pfrort on the part of our communication intelligence personnel. 

It is recogn1zed 1 ;f course, that communication intelligence is 

of no value unless 9roper oμerational use o~n oe made of lt However, momentary tactical advantage is seldom worth the risk of 

compromising the source, for such compromise will stop the flow 

Jf information and thereby vitally affect operations on all 

fronts anu in all areas. 

4. tn order to further the maintenance of high security 

tn regaru to communication intelligence, the following regulations for the dissemination and use oI this tntelligence are herebj 

vresoribed. 

Declassified and approved for release by NSA on 01-30-2014 pursuantto E.O. 1352a s: 

SEGFIS:i' 
A General. 

(a) Particular care ~ust be taken in every command 

to insure that communication intelligence is provided with 

special security safeguards ~nu is seen and handled oy the ~bsolute minimum number of selected yereons necessary for 

its handling and use 

(b) In exposed locations where enemy action is 

possible, particular ~recautions shall be ta~en to destroy all evidence of communication intelligence sources, includ-

• ng ?uthorized files of communication intelligence messages, 

in order that there may be no possibility of its falling into enemy hands. 

~ Cr;ptanalytical, or "Special." Intelligence. 

(c) The utmost secrec~ shall be used in dealing with cryptanalytical, or "Special," intelligence, 1.e., 

information resulting from the reading of enemy encrypted Qispatches 

(d) Cryptanalyttcal, or "Special," 1ntPlligence snall oe passed on to suoorc1nate commanders only in the 

form of operational ulrectives wnenever ~racticable 

(e) ~hen such intelligence must be given out to 

lower commanders as tnformat1on, it shall oe passed without 

clny reference to its secret source and shall contain, somewhere near the beginning of the message, the word "ULTRA, 11 

Or the word 11 SUPER 11 

(f) Only cryptographic systems ~f the hi;hest 

security, t.e., Tjpe X, ECM, HCM, CCM, or one-time cipher, 

ena. of the narrowest distrioution which includes the orig- inator aaa. addressees, shall be used for transmitting 

cryptanalytical, or "Special," intelligence, or any direct 

reference thereto. 

(g) However, in exceotional instances where it 1s 

absolutely necessary to I.Jass cryptanalytical, or "Special, 11 

intelligence to non-holders of these O!yptographic systems, only tne barest ~ssent1als required for necessary action D~ the addressee(s) shall oe given, ~na the information 

shall De transmitted in the cryJtographic system of the 

htghest available security. 

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SECRET 
REF ID:A61230 

SECAET e 

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{h) In disseminc.tine:, cryptanalytical, or 11 Spec..Lal, 11 

intelligence to lower echelons, cE<re shall be ta.It.en to 

avoid, when possible, quoting exact dates, times, positions, 

or actual names of enemy units in a manner whereby the disseminated 1nfo1mat1on, if intercepted by the enemy, can be 

tied to the original source 

(1) Every effort shall be made to avoid indicating 

any connection oetween the source of iatelligence and. the 

ouicome of operations. When action is based on cryptan~lyt1cal, or "Special," intelligence, local commande~s should 

insure toat the action cannot be traced to this source of 

jntelligence alone. 

(J) All copies of translations and paraphrases ~f 

cryptaaalytioal, or "Spectal," intellisence shall oe stamped 11 ULTRA11 or 11 SUPER11 in addition to the usual secrecy classi-

;'tcation 

(t) No reference to cryptanalytical, or "Special," intellibence shall be made in war diaries, reports, yro- ceedings, etc , however limited the circulat1on, without 

s:μec_fic ..... uthori ty of the Chief' of ~"a.val Operations 

C Tr~fflc Intelligence or "Y" Inferences. 

(1) Traffic intelligence or "Y" inferences, 1.e., 

mforma.tion dervied from enemy communications bl methoas 

short of cryptant.1.lysis, shall be stamped 11ULTRA' or "SUPER" 

anu treated on the same level as cryvtanalyiical, or 

11 Special 11 intelligence when it is of oov1ous importance. Otner intelligence ~f this nature, including that derived 

from enemy plain language, shall oe treated as SECRET. 

5. Transmission of this letter by registered mail withLD the continent~l limits of the Untted States is authorized. 

Copy to. 

Chief ~f Staff, U.S Army 

Cmar. 3rd Fleet 

Cmdr. 4th Fleet 

CTF 16 

DNI 

DNC 

G L RUSSELL 

Flag Secretary 

E. J. KING 

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