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• 

REF ID:A71100 

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as June 1946 

H'FJ!OIWmu1J Jt\)~'h Mr. William F. Friedman. Chairman 

Research and Development. Suboommittee 

SUBJ!.'.CT1 Approved '...~ttthod oi Opol'&ticm (JlCG). 

. 

< 

Inaloeed herewith tor yo\ll" i.."l!'orma.t1on amt tilo i• a. copy ot 

l Incl 

Copy ot JI~ Api)Z'O\"Od 

V..et..liod of Oporatf.OD. 

,.- .. , .. -. 

- I I 

, I ' 

I 1 • 

' ' 

';iASO:U G. CAl~DELL 

JOJm '11. CALLAIWi 

Seoretar1at. USCICO 

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Declassified and approved for release by NSA on 05-29-2014 pursuantto E.O. 1352a 

... _ 
SECRET A CONl!E0~~71100 ~STRICTED 

W' DATE 1 October 1946 W 

TO FROM TO FROM 

_Chief, ASA 

Executive 0 

x Dir Comm Res 

Ch, Hist Unit 

Control 0 

_ Asst Chief (Staff) 

Ch, Pers Sec 

Ch, Org & Tng Sec 

Ch, Plans & Oper 

Ch, Materiel Sec 

Ch, Fiscal Sec 

Adjutant, ASA 

Ch, Sec Cont Sec 

Asst Chief (Oper) 

__ Ch, Intel Div 

Ch, Lab Br 

Ch, Machme Br 

Ch, Crypt Br 

Ch, Int Cont Br 

Ch, I & D Br 

( ) As Discussed 

( x) As Requested 

(10)_ 

(11)_ 

(14)_ 

(13)_ 

(15) __ 

(20)_ 

(21)_ 

(22)_ 

(23)_ 

(24)_ 

(25)_ 

(26)_ 

(27)_ 

(60)_ 

(90)_ 

(91)_ 

(92)_ 

(93)_ 

(94)_ 

(95)_ 

( ) Concurrence or Comments 

( ) Information & Forwardmg 

( ) Inf ormabon & Return 

_ Ch, Secunty Div (80)~ 

P & 0 Staff (81) __ 

Ch, Materiel Br (82)_ 

__ Ch, Methods Br (83) __ 

__ Ch, Protective Br (84) __ 

___ Ch, Mamt Br (85) __ 

__ Ch, Res & Dev Div (70) __ 

Tech Staff (71) __ 

Ch, C1ph & C1ph Br (72)_ 

Ch, Int Eqmp Br (73) __ 

Ch, Elec & Elec Br (74) __ 

Ch, Lab Serv Br (75) __ 

Ch, C'logic Br (76) __ 

Ch, Pers & Tng Br (61) __ 

_Ch, Supply Br (62) _ 

__Co, Arlington Hall (40) __ 

_2d Sig Serv Bn (50)_ 

( ) Information & File 

( ) Recommendation 

( ) Signature Ji approved 

( ) Your action by 

( ) Info upon which to base reply 

l{;t._t.I'~ j:,j~§i.r.....c:ieteoroJ ogi c..a.l__xequi rement.s... __ J:_...fee1-±.hat._ .t.he_ 

!'~-~_!l.lts 1nd1c~~~d _ _b.ei:_~_t!h.~-~l_n t__l~Q.~;r..Qper~ discharged 

~_!l.1~ the -·~~~!ll'j,.~x_ __ Q;!,_v_:~sion ;·-msd:;;,~;:::::- the \va:r..r__ 

---- -------- ------ ----- ------ ---- A-. .SIUKO:V - ---------------------- WPGSS FORM NO 9b (Rev 10) 2 APR 4b 40374 Chief, Secu~lty Divisi9n 
".9' - liii ''4111 

I 

la.pproved llethod of Operation for the 

Joint Interaept Control 1Gr'oup (JICG) 

7 June 1946 

1. Reterenae 11 made to a paper dated 18 February 1S46 and 

entitled nnutiea arld Re1pon1ibilitie1 of Coordl.Xl8.tor of Joint Operationa• 

whioh diroota the establiahment and operation or a Joint Interaept Control Group (JICG)-

2. The JICG 11 to be organized as 1nd1oa.ted 'b"J the chart whioh ia 

attached as :Rxh!bit 1, and aa outlined below. 

3. The Deputy Coordinator for Interaept Control 'Wl.11 be the officer 

1n charge of the JICG. T'hioh will be organized am sta.ti'ed as indioated 

in aubparagraphs a. through g. ... 

a. Two Prinoipal "411iatanta. phyaioally looat"ed 'I'd. th the 

Deputy Coordinator, one eaoh to be prondod by .\SJ. and OP-20-G. i'he 

operational persormel o£ the JICG \vill report to the Deputy Coordinator 

for Intercept Control through theae asaiatanta. (Lt. Johnson of OP-20-G 

ancl. Mr. Patton of .:.sA are the incumbents.) 

b. Three Coverage .nnalyata, phyaioally looa.ted 1' th the 

a.aaiatm tsJ both i& c.nd OP-20-G are to ha ire representation in the 

aoverage analysis group at all times. The a114ly1ta 111.il perform the 

opera.tional work ,invelved in preparation or intercept &BBigmnents, 

keep :reoordo on &'Vllllablo faoilitios and oo~ra'j·· ... capabilities, aheak: 

station perform.a.nae. prepare all reports to .. concerning Arlfty1 

Ns:vy and coordinator intercept tasks, eta. Incum.benta are Lt. Potvin 

ot OP-20-G lllld :..r. Duwl and Jr!i.ss Smith or JJliL.) 

c. "'"' Da.1ly Covera.ge Report Studies Group,\ physioa.lly loco.tad 

111 th the coverage analysts, and oomposod of peeple furnished by ASiL c.nd 

OP-20-G. This group 11'111 proceas da.1ly aovard.ge reports. frmn. all 

.A:nr:y and Navy stations performing joint ta.ska to determine periods 

and quality of covora.ge, and wi.~pa·. re 11Sohedule /.,11\ ·.(a monthly cover - age report tor di11emination to L__J and auoh other coverage reports 

a.a may be decided upon trm time to time. (Hi.BB 'Gruoza\of .1'61'- is at ' 

;resent the supern.sor of this group of 14 persona.) 

I 

de ""Wave Propagation .nnalyst, to bo located \11th tho 

coverage a.nalysta, c.nd to bq furnished ~ e:l:thal" B&J:'Vl.ce. \This 

individual is to aonduot the ionospheric studies Bnd produce the wa:ve 

propa.ga.tion data required by all uni ts of •• SA a.nd OP-20-G.. \(Incumbent 

is lli11 Repke of .n&ii..) 

PL 86-36/50 USC 3605 

EO 3.3(h)(2) 
) .. PL 86-36/50(.JSC 3605 

EO 3.3(h)(2) 

• 

7 .June 19.46 

o. .An Ill Case Book (ICB) Preparation Group, to be located 

at 

rosponsibility 

OP-20-G and 

the 

composed 

preparation 

oi' Na.val 

of 

personnel. 

the ICB for 

It 

distributio.n 

"'6.11 have as 

to 

~ 

L___J 

and .c'unerican users. (The group n.t present is com.posed ot 5 persona, 

'Wl. th Lt. (J .G.) Tleiland as supervisor.) 

f. An International Ccmnercial Radio (ICR) traffic Studies 

Group, to be located o.t .t}.1"lini:;ton Hall Station and cdlll.posed nf ~i. persozm,el. It will have as ita responaibility the tabulation of ICR 

tre.fi'ic copied by Arar;/, Navy. I !stations, £.nd the 

prep9.l,"ation of ste.t1st1cal reports thereon. The principal report to 

be produced by th:h group lists volume of traffic by radio trensmitter 

and circuit, indicating the cryptographic system, point o:f' origin 

and point of deati:a.ation for ea.oh m.essn~~· These reports e.re used in 

the determination o:f' intercept prioritiea and to check interce-,t 

station performelloe. (The group at present consists o:f' two units, o. 

Tra.ti'ic Preparation Unit o:f' 24 persona supervised by Hill Perrow, and 

an IBM l.nalysis Unit of 8 persons supervised by liiss Rhea.) 

g. A Stenographic c.:.roup o:f' apprbxime.tely 3 persons, to be 

provided by the Deputy Coordinator :f'or Intercept Control. 

4. The statistical re"ports prepared by the ICR Traffic Studies 

Group wi~l be furnis~d to the De~uty Coordinator for Processing 

J...llocation an.d to oogriize.nt intelliGence representatives o:f' the ~>Z'lq 

and :Navy. The JICG Teohnioal Ste.rt will meet regularly' (monthly, 

initially) 111.th these- intelhgence represontatives and with a representative of the Joint Processing Allocation Group in order to est~blish 

intercept and fcrwurd~ng priQrities. 

5. A t~ble showing present und proposed l.:rmy o.nd Navy intoroept 

facilities is ~ttaohed as Exhibit 2. It is itemized to show the 

approximate allocation of f'aoilities to joint intercept and to 

purely Anq or Navy taaks. 1'he ficures given are only estimates, a.a 

the actual allocation is expected to vnry tram d&y to daJ.• 

' 

6. Control of Army or'liavy fQcil1ties perrornu.ng service intercept 

will continue to bo exercised by the J.SA end OP-20-G intercept control 

organiJ.ations, and priorities therefor will be established by these 

control groups in conjunction 111. th the crypta.nalytic and intelligence 

representatives of tho respective services. 

?. Initi~lly, as an operatio~l convenience derivin~ from the 

nature or existing 'OOJlllll.unication facilities, DD.d to insure thc.t all 

directives to any intercept stQtion are c~eled through the same o:f':f'ice, 

mission9 will be routed frCID. the Deputy Coordinator for Intercept Control 

2 

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7 June 1946 

' to the intercept stations through the AS,\ or OP-20-G intercept control 

group concerned. These control groups 11111 normally serve only as 

relAy points tor auoh messages and are not to delay transmission of the 

messages for performan.oe of any re'Vl.~w, oaordinetion or other functions. 

The Army and Navy groups wl.11 havo oognizanoe over the contents only to 

tho extent thPt they may return n mission to the JICG for reconsideration 

'When the mission is considered too largo for performance by available 

facilities. 

a. Thia method of routing messages will e.utamatiocilly keep the 

Army and Navy control g;roups informed of the mi11ions a11igned to 

stations under their control. The army and Na"fY control groups, in turn, 

will keep the Deputy Coordinator for Intercept Control fully informed 

an tho f~ll0W1ng 1ubjeota1 

a. Service misaions'ass1gned to all stations. 

b. Facilities ~.nd persomiel nva.ilable at e&ch station and 

numbers used in perfo:rmcnce of service lli.iss:!.ons. 

c. Volumes nnd types of messages copied from assigned 

service circuits. 

d. ..\ll dat~ pertinent to the ICB. 

' 

" • I . .. , ,, ~ r-:---1 I'-\ ~..., ,,. ,_./; 'v I • 

-" &\NFOBD ~. COlliBLL 

:llajor, Blgnal Corps 

Deputy Coordinntor for Intercept Control 
• • r • 

• 

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.11.1"l1ngton Hall Station • 

I 

ASA. 

Organizational 'Diagram, 

Joint Intercept Control Group (JICG) 

ilHERE LO CA.TED 

Joint Intercept Control Group 

Location 

lilxhibit 1 

I 

, Naval CCllllD.unicationa 

Amlex. 

I ~,-_,........,._ 

S~.TIOBS 

J :M 

I I 

JICG- Jl1 ailio11a 

EPUT!' 

OOOBDINl"Tat I I OP-20-G 

JIOG lli.B&iona STATIONS 

FOR IHmRCEPT COlfi'ROL J 

I I 

c s 

G S 

o!"' Col11&ll 

\ 

c s 

c!: I 

J,. 0 

S N 

A S - I m I 

I 

CONTROL I 

----------- .ASSil:r:Aft 

• Pa.tto 

r 

I 

n 

J~ 

TRAFFIC 

STUDIES 

Miaa Perrow 

Jliaa Rhea 

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Mr. Patton 

Cuv :Ri.\GE 

,,JU.t.LYSTS .. Lt. Potvin 

!.ir. DuVB.11 

W.aa Smith 

-

Sl'ENOGR.!.PJjI c I 

GROtJ"P 

OP-20-G I I 

I 

G S 

I 4. I 

\ 

6 0 

R N 

AIS 

A.bSISTallT ----.,---

OP-20-G 

CONmOL 

Lt. Johnson 

I 

m .. lil!i 

PROP.A<UL'L'ION 

.. 'Jt.\LYST 

?.Ii BB Rei>ke 

I 

D.t&.ILY 001/'ER.\.GE 

BEPORT STUDIES 

:Miaa Gruoza 

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_Lt. Novak 

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I PREPl&TIOii 

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• (J .G.) ileiland J 

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I Lt 

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' I "' ... --.... - ---. --,- ------------ _. _ - --.. --- ---... - ---- -- --- Operational Control 

- - - Liaison Contacts 
• I .. ,. 

Disposition ot S?Al;CIB Intercept Facilities 

Amy or Navy JICG 1. 

Hisaions and His1t1ons and II 

1' Control Control I 

I 

Data Service 

.1 I 

3 49 ii 52 1 .April 146 

40 22 62. l Apr:5rl '46 ... .,,,. 

67 120 ,, 187 8 July '46 

I 

I i~ II I 

44 68 8 July 146 

I I II ' I 

250 20& I, 456 Ultimate ! ll:nq ,, 

• II 

178 156 ii 

I 334 Ultimate Na.vy I 

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428 362 I 790 tntimAte. I . TOTAL I 

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