REF ID:A488967 

; 't' ' , ~ . ~- ~· ' ·: ~ ~~ • • ; . I : •'. ;i ( :t~ .. ;. *'' . - . . 

I~ Completed war h1stor1ea. 

). ). . 

I'J .. 

R.I.P.s. 

H1ator1oal publ1cat1on8 other then R.I.P.s 

Section histories 

l. HCA aect1ons 

2. FRUPAC aectiona 

War hlatorles undervay. 

War hiatories under revision. 

Prot1J>ect1va war histories. 

I ~-:i 

.... ' 

::JO 

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Declassified and approved for release by NSA on 11-04-2013 pursuant to E .0. 1352a 
.A. he f.P"1 

I. COMPLETED WAR HISTORIES 

TITLE 

PREPARED BY 

SECTION 

BOW 

STOWED 

A-1 R.I.P.a 87z, 98, 102, and 300 form a series or 

4 Tola. 

R.I.P. 87Z THE ROLE OF RADIO INTELLIGENCE in the AMERICANR.I.P. 98 

J APANESE ... VAL WAR 

(August, 1941 - Juae, 1942} NA 

Chap. I Prelude to Pearl 

Barbor 

II Battle of Coral 

Sea 

III Battle of Midway 

IV Conclusion 

completed 1 Sept'42, registered, 1 Tol. 

-.Ii 

~ 
REF ID :A48896-.:Z'J..-.-~--

~ Ur O~JJJ~~t ~ 

Ii-~ .. (cont'd) 

TITLE 

R.I.P. 102 THE ROLE OF COMMUNICATION INTELLIGENCE in the 

AMERICAN-JAPANESE NAVAL 

WAR VOLUME III 

'.l'he Solomon Islands 

Campaign 

1. Background of the 

Landing on Guadac anal I s land and 

the Battle of Savo 

Island (July 1-Aug 

9, '42) completed 22 June '43, 

registered, 1 vol. 

R.I.P. JOO THE ROLE OF COMMUNICATIOB IN'l'ELLIGENCE in the 

AMERICAN-JAPANESE NAVAL 

WAR VOLUME tv 

The Solomon Islands 

Campaign 

2. Background of the 

Battle of the 

Eastern Solomons 

(August 23 - 25 1 42) 

completed 1 Dec '44, 

registered, l vol. 

PREPARED BY 

SECTION 

NA 

BA 

If OW 

STOWED 

Al-chi Yea 

ArohiY•• 

A-2. R.I.P.a 330-336 1nclus1ve rorm a aeries or 5 vols. 

R.I.P. )JO THE ROLE OF COMMUNICATION INTELLIGNECE in the 

DIPLOMATIC BACKGROUND OF 

THE AMERICAN-JAPANESE 

WAR VOLUME I NA Archive• 

(February U+, 1941 - May 

12, 1941) 

in two parts, A and B 

A - H11ll-Nomura Converse.ti on~ 

B - Japanese D1~lomat1c 

Activities 1br~ughc:nt the World 

J u.n~ . 'JW ~ . - - '~-- r.J P ::~ C 

! .Li f lt-'f"~ : : t I '111 • • 

••• . ~ 

·--

·r 

r 
10F srx:tE'f' OOPS"S 

A-2. (cont'd) 

TITLE 

PREPARED BY 

SECTION 

R.I.P. 331 THE ROLE OF COMMUNICATION INTELLIGRNCE in the 

DIPLOMATIC BACKGROUND OF 

THE AMERICAN-JAPANESE 

WAR VOLUME II (May 12-

August 6, 1941) 

in three parts, A, B, 

and C 

A Hull-Nomura Conversations 

B - Japanese Naval 

Intelligence in 

Diplomatic Messages 

C - Japanese Diplomatic 

Activities Throughout the World 

completed 25 Sept. 144, 

registered, Copy 1 is 

bound in 4 folders, copies 2-8 in two folders each. 

R.I.P. 332 THE ROLE OF COMMUNICATION INTELLIGENCE in the 

DIPLOMATIC BACKGBOUND OF 

THE AMERICAN-JAPANESE WAR 

VOLUME III (Aug.5-0ct.17, 

1941) 

Containing parts A and 

B only. Part C is bound 

as R.I.P. 333. 

A Hull-Nomura ConTersations 

B - Japanese Naval 

Intelligence in 

D1plomatic Messages 

completed 1 March '45, 

registered, in l folder 

NA 

NA 

BOW 

STOWED 

Archive• 

ArchiYea 
A-2. {cont'd) 

TITLE PREPARED BY BOW 

R.I.P. 333 THE ROLE OH COMMUNICATION INTELLIGENCE in the 

DIPLOMATIC BACKGROUND OF 

THE AMERICAN-JAPANESE 

WAR VOLUME III (Aug.5-

0ct.17, 1941) 

Containing Part C only. 

Parts A and I)lre bound 

as R.I.P. 332 

c. - Japanese Diplomatic 

Activities Throughout the World 

completed 1 Oct,',5, 

not registered. co,7 

1 is bound in 4 folders, 

copies 2-8 in 2 folders 

each. 

R.I.P. 3J4 THE ROLE OF CO~ICATilll INTELLIGENCE in the 

DIPLOMATIC BACKGROUND OF 

THE AMERICAN-JAPANESE 

WAR VOLUME IV (Oct. 17-

Dec. 7, 1941) BA 

Containing Parts A and 

B only. Part C is bound 

as R.I.P. 335. 

A- Hull-Nomura Conversat iona 

B - Japanese Naval 

Intelligence in 

Diplomatic Messages 

completed 15 Nov.'45, not 

registered, in 1 folder, 

e&cept copy 1, which ls 

in two folders. 

SECTION STO)fEll? 

BA Arch1Yea 

Arch1vea 

t41·r·fJ ~i.i--:.£,QPS~ 

\ \ 

------- ·-------------·-

·.i--· 

~ l 

~ 

'· 

.. 
A-2. (cont'd} 

TITLE 

PREPARED BY 

SECTION 

R.I.P. 335 THE ROLE OF COMMUNICATION INTELLIGENCE in the 

DIPLOMATIC BACKGROUND OF 

THE AMERICAN-JAPANESE 

WAR VOLUME IV (Oct.17-

Dec.7, 1941) 

Containing Part C only. 

Parts A and B are bound 

in R.I.P. 334. 

C - Japanese Diplomatic 

Activity Throughout the World. 

completed 15 Nov.'45, not 

registered. C~pr 1 is 

bound in 3 folders, copies 2-8 in 2 folders each. 

R.I.P. 336 THE ROLE OF COMMUNICATION INTELLIGENCE in the 

BIPLOMATIC BACKGROUND OF 

THE AMERIGAN-JA:i;ANESE 

WAR VOLUME V ( Sup:Jlement 

to Vols. I-IV} 

in two parts, A and B, 

A - Hull-Nomura Conversations 

B - Japanese Diplomatic 

Activities Throughout the World 

and inc 1 ~1d.ing 

Index to Vols. I-V 

Special Appendix (Summary of Hull-Nomura 

Conversations) 

com~leted 15 May '46, not 

registered, in 1 folder 

HA 

NA 

BOW 

STOWED 

Arch1Ye• 

Archives 
REF ID:A488967 

TOP ~!!!CRE'f OOPS:S 

PREPARED BY IOV 

TITLE SECTION STOWED 

A-3. R.I.P.a 340-347 inclusive form a series or 8 Tola. 

Each Tolume of this series contains text, appendix of decrypts, ComSubPae dispatches, and submarine 

reports, together with charts and analyses of 

results. Other publications, not R.I.P.a, edited 

at FRUPAC, continue the series through Fe~ary 

1944.J see section I-B of this inventory. 

R.I.P. J40 THE ROLE OF COMMUNICATION INTELLIGENCE IN 

SUBMARINE WARFARE IN THE PAC~IC (January 1943-

0ctober 1943) 

Volume I (January 1943) 

completed 19 Nov.'45. 

not registered, in l 

folder. 

R.I.P. 341 THE ROLE OF COMMUNICATION INTELLIGENCE IN 

SUBMARINE WARFARE IN THE 

PACIFIC (January 1943- . October 1943) 

Volume II (February 1943) 

completed 26 Nov.'45, not 

registered, in 1 folder. 

R. I. P • 342 THE ROLE 01<~ CD MMUNICATION INTELLIGENCE IN 

SUBMARINE WARFARE IN THE 

PACIFIC (January 1943-

0ctober 1943) 

R.I.P. 343 

Volume III {March 1943) 

completed 29 Nov.'45, 

not registered, in 1 

folder. 

THE HOLE OF COMMUNICATION INTELLIGENCE IN 

SUBMARINE: WARFARE IN TRE PACIFI~ (January 1943-

0ctober 1943) 

Volume IV (Aprll-!fay 1943) 

completed 10 Dec. 1 45, not 

NA 

BA 

NA 

NA 

reg~atered, in 1 folder. __ . , ~;r,~s t.-- - l .,.... .., :d.:• j r, ~ { ~f ~:tlbd\t ~ ':POP 31>".~HE'f GOPSI.~ 

Aroh1Te• 

Archi•e• 

Archives 

Archives 
!6f' 5r~Sfi:E'f COPSE 

A-J.(cont'd) 

PREPARED BY NOW i 

TITLE SECTION STOWED 

, ~ R. I.P. 344 THE ROLE OF COMMUNICATION INTELLIGENCE IN 

SUBMARINE WARFARE IN THE 

PACIFIC (January 1943-

October 1943} NA Archives 

Volume V (June 1943) 

completed 1 Dec.'45, not 

registered, in 1 folder. 

R.T.P. 345 THE ROLE OF COMMUNICATION INTELLIGENCE IN 

SUllMA.RINE WARFARE IN THE 

PACIFIC (January 1943-

October 19i3) NA ArchiYea 

Volume VI July 1943) 

completed 11 Jan.'46, 

not registered, in 

1 folder. 

R.I.P. 346 '!'HE ROLE OF COMMUNICATION INTELLIGENCE IN 

SUBMARINE WARFARE IN THE 

PACIFIC (January 1943-

October 1943) NA Archives 

Volume VII (Auf1st - September 1943 

completed 15 Jan.'46, 

not registered, in 

1 folder. 

R.I.P. 347 THE ROLE OF COMMUNICATION INTELLIGENCE IN 

SUBMARINE WAHFARE IN THE 

PACIFIC (January 1943-

October 1943) NA Archive1 

Volume VIII (Octo~er 1943) 

completed 28 Dec.'45, not 

regiaterf;d, in 1 folder. 

'fCH 3r3C RE'f' COPSE 
REF ID:A488967 

TOP SECRET COPSE 

TITU 

PREPARED BY 

SECTI01' 

A-4 

R. I. P. 99 

A-5 

THE COMMUNICATION INTELLIGENCE ORGAINZATION OF 

THE BRITISH EMPIRE 

Part I - Administration 

of the "Y" 

System 

Part II- Operations of 

the "Y" System, 

subdivided into 

many chapters 

on Bletchley 

Park, the Admiralty, the intercept nets, 

Far East organization, 11 ai son, 

etc. 

completed 5 Aprtl '43, 

registered, 1 Vol. 

R.I.P. 198 GYP-5 SUBSECTION HISTORY 

covering the section's 

history to the end of the 

war. 

A-6 

completed in February 1946, 

registered, in l vol. 

BA 

GYP-5 

R.I.P. 205 DISSEMINATION OF DECRYPTED GO at 

JAPANESE WEATHER AT FRUPAC FRUPAC 

a history of the weather 

section, GO, at FRUPAC, 

written at FRUPAC, published 

at NCA, registered, in 

1 vol. 

~OP SECRE'I' COP3E 

8 

wow 

STOWED 

Arch1Yea 

Archives 

Archives 
·rof' 5!CfU~'f COPSE 

REF ID; A46B.-967 

l~P ~lffiMtij~ TITLE 

PREPARED BY 

SECTION 

A-7 

R.I.P. 480 U.S. ATLANTIC RADIO 

DIRECTION-FINDING 

ORAANIZATION GTA 

A-8 

R.I.P. 425 

Y0~ S~CREf COPSE 

Chap. I Introduction. 

Chap. II Typical 

Operations. 

Chap. III Struggle for 

Completeness, 

Accuracy, and 

Speed. 

Chap. IV Collateral 

Act1T1t1ea. com~leted Oct. '45, not 

registered, l Yol. 

THE AMERICAN ATTACK ON aYA-1 

THE GERMAB NAVAL CIPHERS & 2 

Chap. I Introduction 

II Problems and 

Solutions 

III Research and 

Development IV Operations as 

a Going Concern 

V History of the 

Groups - a 

history of the 

t'unctione, 

personnel, 

spaces, techniques, performances of; 

A. The Traffic Group 

B. The Crib Group 

c. The Bombe Group 

D. Tbe Decryption Group 

E. 'T'be Communication Group 

F. The Sub Section Watch 

Officer - including - - man .ari es of 

\f"._\ ',r . \ ;a. i s:ry from 

' I " to May ig45. lU) 1 

I C C;' f '5/7 

IOV 

STOWED 

Op-202'1'2 

AFSA-0.3A3; 

m.1crofibl 

in arch1Yes 
B. Historical.publication other than R.I.P.s; these 

were written at •RUPAC. 

TITLE 

B-1 RADIO INTELLIGENCE IN WORLD WAR II: 

Tactical Operations in the Pacific 

Ocean Areas 

December 1942, in 1 Volume 

January 1943, in 1 Volume 

February 1943, in 1 Volume 

(These three •olumes contain text, 

decrypts, CINCPAC dispatches and 

bulletin• etc. They continue, in 

a different form, R.I.P.s 87 Z, 

98, 102 1 and JOO; see subsection 

I-A-1 of thi• inventory.) 

B-2 RADIO INTELLIGENCE IN WORLD WAR II: 

Submarine Operations in the Pacific 

Ocean Areas 

Iovember 1943, in 1 volume 

December .1943, in l volume 

January-February 1944 (in Part), 

in 1 W'olume 

(These three volumes continue, in 

a different form, the study con- t~ined in R.I.P.s 340-347 covering January through October 1943; 

see subsection I-A-3 of this 

inventory. 

'POI' 3£0Rt:'f COPSE 

•ow 

STOWED 

Archives 

Arch1Yee 

ArchiYes 

Archive• 

Archives 

Archives 
TOI' 5t:CHE9:' COPSE 

C - Section Histories 

C-1. NCA Section Histories 

TITLE and/or REMARKS 

Histort of the Pacific Strategle Intel~gence Section 

2 copies covering period from December 

1944 to the end of the war, 6 pp. 

Section Histort and Or~anization, 

February 19430 Decem er 1945, 9 pp. 

Section Historz Op-20-3-GC 1 copf 

1 copy, bound in 5 vols., having no 

title. The opening sentence reads: 

"The following study presents an 

account of U/B war from December 

1942 to May 1945 as seen through 

and as influenced by the decryption 

of German Naval radio traffic in 

Op -20-G." 

Vol. I 

II 

Allied Naval Communication 

Intelligence in the Battle 

of the Atlantic 

U/B Operations 

treated tn 5 parts, A - E 

A-D treat major periods of 

Atlantic U/B operations 

E 

in chronological order, 

deals with German Naval 

Operations in Far East, 

including surface and 

submarine blockade 

running. 

PREPARED BY 

SECTION 

G-50 

GB 

GC 

GIA 

BOW 

STOWED 

Archives 

Archives 

Archives 

Archive• 
!uf Sl!:Cftl!!'f eePSE 

C-1 (cont'd) 

TITLE and/ or REMARKS 

III German Naval Communication Intellis-nc• and 

the Compromi•e of Allied 

Ciphers. 

IV Technical Intelligence 

from Allied C.I. 

V German Naval Grid and 

its Cipher 

History of Section Op-20-J-GID 2 coples 

and Opera102 pp. 

Organization, Chart, Chronology, 

Statistics, 

August 1943 Bovember 1945 

l copy 

Hiatog of Section o.t.Mathematical 

and P ta!cal Reaearcli, 

February 1943 - October 1945 

3 copies, 22 pp. 

History of °i-21-~-gj 15 May~94Z o en o war, 1 copy 

A Histo:S; of ~-20-~-GR 7 Decemer 19 toeptember 1945, 

2 copies, 13 pp. 

~OP 380R~~ COPSE 

PREPARED BY 

~'l'IOB 

GID 

GIP 

GL · 

GM-6 

(GK) 

GQ 

GR 

wow 

STOWED 

Archive• 

Archive• 

Archive• 

AFSA-OJAO(~ Crane ( 1) 

Archive• 

Archive• 
REF ID:A488967 

~GP SEGRB'f' SOPSE lfif SHDRFf~ C-1. (cont'd) 

TITLE and/or REMARKS 

A general history of the "Y" sections, 

or the GYP history 

A history of BYP-1 

A history of GYP-2 

(The histories of GYP-4 and 6 are 

covered in the general history of GYP) 

GYP-5 Subsection Histoaz 

Thia his been publish• and registered 

as R.I.P. 198; see under R.I.P.a, subsection I-A of th6a ini'entory 

A history of the weather section, GYP-7 

2 copies, no title 

(The history of GYA-1 ls contained in 

Chapter V, Parts A, B, D, and E, of 

"The American Attack on the German 

Naval Ciphers". See subsection I-A-8 

of this inventory) 

(The history of GYA-2 is contained in 

Chapter V, Part C, of "The American 

Attack on the German Naval C~phers". 

See subsection I-A~8 o~ this inventory 

(~CA section history material is also on 

file ln the Arcb.:'..ves jn the form of war 

diaries. Presumably tho b·;lk of their 

cor:tent has been 'ncorporated :tn the 

above section h:tstori 1 J:C' ~; 

~ ' --,' . 

PREPARED BY 

SECTION 

GYP-1 

GYP-1 

GYP-2 

GYP-5 

BOW 

STOVED 

Archive• 

Archive• 

Archf Te8 

Arohivea 

$ 

.• ;J 

------------------ -------~-

______ J 
REF ID:A488967 

~OP ~ECft~! C6PSE 

C-2. FRUPAC Section 

lO~ Histories 8reRtr~ 

TITLE ap.4/or REMARKS 

Disaemination ot Decrzpted Japanese Weather at FRUPAC 

This has been publiahed and registered 

as R.I.P. 205; see under R.I.P.a, 

section I-B or this 1nwentory 

Organization and Scope of GX-G• 

December 1941 to the end of the war 

JN 22 

Though largely technical, on the 

cryptanal1sia and decryption of JN 25, 

thia folder also contains general history ot GY-1 

Cryptanalytic studies rather than 

history 

On technique (JI' 11), rather than 

general history or the section 

This folder deals v1~h methods or 

decoding, samples of messages and 

their solution etc for m1no• systems, 

JN 33, 40, 166, 199 and others 

A summary O! tn~ w· rk o:' the sectlvn 

General Outlin~ and Functioninf of 

onJ:nrmi Worl War II from 19_1 to 

History of CICFOR 

~eport on ~AGFOR 

2B December 194'.h 

PREPARED RY 

SECT I OB 

GO 

GX-GT 

GY-1 

&Y-1-1 

GY-2 

GY-3 

GY-S 

GZ 

BOW 

STOWED 

.ArchiYea 

Archi••• 

Arch1••• 

Arch1Yea 

ArchiY•• 

Archive• 

Arch1vea 

Archive• 

Archi•e• 

Archi••• 

I 

i 
REF ID:A488967 

·rop S:SGRE'f eOPSE 

II. WAR HISTORIES UNDERWAY 

and 

III. WAR HISTORIES UNDER REVISION 

As far as can be determined there are no war 

historiea actually underway or under reYiaion. 

All studies that might be included ln these two 

categories are 11ated under Section IV as 

prospect1Te var h1ator1ea. 

'fOf SECRET OOPSE 

15 
REF ID:A488967 

IV. PROSPECTI~E WAR HISTORIES 

A. A history of subsection GYA-3 was noted in 1946 

as "partiall7 completed (Brand!)•. This was being prepared by GYA-3 and was •towed n NY-4. Present location 

and status is unknown. 

B. A study on security leaks was noted in 1946 as 

begun by NA, the purpose being to bring up to date the 

study conta1ned in chapters III-V of RIP 98. (See subsection A-1 of this inventory.) It was planned to 

publish this material as a RIP. Present location and 

status is unknown, except that Op-202 has a current file 

on the subject. 

c. Studies of the part played by commun~cation Intelligence in the Pacific during World War II have not been 

made ~or battles subsequent to the Solomon Islands campaign. 

Studie• of at least the great engagements at Saipan, the 

Philippines, and Okinawa should be undertaken. Much or 

the material suitable tor this purpose ls on file in the 

archives 1n the form of RI Swmnaries. 

C•ote: The aeries or studies entitled 

THE ROLE OF COMMUNICATION INTELLIGENCE 

IN THE .AMERICAN--.JAPANESE NAVAL WAR has 

been completed at HCA nnl7 through the 

Batrle or the Eastern Solomons, Aug. 

22-23, 1942. ~ee subsection A-1 or 

this inventory.] The series was continued, in a somewhat differnet form, 

at FRUPAC covering, however, only three 

months: December 1942, January and 

February 1943. (See section B ot this 

inventory)) 

!OP SECR~ COPSE 

16 

·: 
.. 

REF ID:A488967 

!OP SSOR'81f OOPSB 

G,c.c.s. Historz 

Cop~ number 7 of the Government Code and 

Cipher School (GCCS) naval history, Volumea 

I thi-ough XXIV, i• available in the archive•. 

Annex A 

~OP SSGR!i'i' OOPSB 

, .