REF ID:A488562 

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Declassified and approved for release by NSA on 11-06-2013 pursuant to E .0. 1352\3 
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SPSIB-4 

ARMY SERVICE FORCES 

SIGNAL SECURITY AGENCY 

WASHINGTON 25, D. c. 

/, 

1 June 1945 

SUBJECT: Intercept Assignment at Monitor Station Six 

THRU: Chief, Intelligence Division, SPSIS-9 ~j~ 

TO: Director of COIIDilunications Research, SPSIS-3 

1. Attached as Tab "A" is the intercept mission in effect 

at Monitor Station Six, Philippine Islands, during December 1941. 

2. Tab "A" includes an outline of the intercept and traffic 

forwarding directive in effect at Monitor Station Six on 1 December 1941, together with all changes made during that month: 

this outline was prepared from a basic assignment dated 8 October 

1940 and subsequent changes thereto which were sent by radiogram. 

3. This information was obtained from material in the 

Corr.munications Branch central file. These files are being retained 

temporarily in SPSIB-4 and are available for inspection. 

4. A SUI!llll.ary of traffic intercepted at Station 6 during the 

month ending 22 November 1941 can be prepared upon request from 

records available in SPSIB-4; no traffic dated later than 22 November 1941 was received according to these records. 

l Incl 

Tab "A" 

,~ I· -1ud~ _/ TAYL;;y v• -

/ -Major, Signal Corps 

/ / Chief, Traffic Analysis 

V and Control Branch 

SECRET 
- TAB "A" 

1. Intercept Assignment of Monitor Station Six as of l December 1941 

a. Coverage: 

(1) Japanese Military Circuits 

(2) Commercial circuits, in order of priority as followsi 

(a) Berlin to Tokyo 

(b) Bangkok to Tokyo 

(c) Batavia to Tokyo 

(d) Manila to Tokyo 

(e) Tokyo to Manila 

(f) Sait,on to Tokyo 

(3) Search for following: 

(a) Long wave transmissions on above listed commercial 

circuits. 

(b) Long wave transmissions on any other circuits, 

with priority to Tokyo, 1lerlin, .· and Moscow 

transmitters. 

(c) Broadcasts of Japanese coded trai'fic. 

b. 1'ypes of traffic to be submitted: 

(1) All Je.panese, Gennan, Italian, }.';exican, and Spanish 

government traffic. 

(2) Russian b~vermnent code addressed to Komavnech, 

Polpred, or Narkomindel. 

(3) Gem.an, Italian and Mexican government plain-text. 

c. Means of forwarding -craff'i c: 

Radio Clipper 

1. Japanese Diplo- 1. "LA." code 

matic code, having 

5-digit indicator 

in the first few 

groups. 

2. Japanese code broadcast. 

l 

Registered Mail 

1. All military 

traffic. 

2. Diplow.atic Traffic other tmn 

types forwarded 

by Clipper or 

radio. 

3. All plain-text. 
2. Changes In Intercept Assignment kde During December 1941 s 

a. 2 Decembers Copy all Japanese plain-text. 

7 Decembers Forward by priority enciphered radio all ( • 

Japanese plain-text messages ending with \ .. }rtr, ?..,J 

the English word STOP. 

9 Decembers Drop all current directives. Obtain fullest ) 

possible coverage of Japanese Army traffic. ( A,.1,t 3 

Forward by radio as much as possible of' best 

copies of' this traf'f'io. Forward remainder by 

fastest available means. (This was the last 

directive to be radioed to the Philippine 

Detachment.) 
-,-• ' .. .,-:-, ------~----aE-~b1+~4-B-Bi~-=14~...,2~---------

\rr~ PQlllM No. MA fllD 6A .,..... """ r · =rr \) llKfT . &ac .,~ , llAllClt It, • By Au~ho:.:ty c : tM 

Chiat :~;£,.al r"\rf!t'e!' 

TELEGRAM-::: ..;!·~ 

( 

OFFICIAL BUSINESS GOVERNME~ .(.~f.1/ 

SECRET ~:i fJg: 1~~: i~~ 

,,,.,.--- ~AL OFFIGER HAWAIIAN DEPAfil'1IBNT 

f' f '/, 1 ¢ ,.-- - SIGNAL OFFICER PHILIPPINE DEPARTMENT. 

11-1';,tJ ' . 

MONITORING STATION WILL FORWARD IN SYSTE11 THIRTEEN ALL TRAFFIC 

NOW SUB1iITTED IN THAT SYSTEM AS PROMPI'LY AS POSSIBLE 

OLMSTEAD 

SECREf-

.... ~ ........... >-9111 
. STANDA"D FORM No. 1"A • 

APPtlOVm 111' TH! PllHIMNT 

REF ID: A)l"fes6 • 

l' , J. · · · · · ,..,.ctiif\ R DEPARTMENT 

MAllCH 10, ltzl 

TELEGRAM ~.'. 

111: ·.iii.la 

OFFICIAL BUSINESS GOVERNMENT RATES 

'f' b1'6 SIGtlfl.LS 

~SI'1NALS 

--1 '?'(,~ SIGNAl.S 

~<(; SIGN.U..S 

PHIL [PfI:NE DEPARTtmrT · lWJILA PI 

PANAUA CANAL DEPARTif.F ..• NT QUARJ~Y HGTS CZ 

11D!TH CA PRESIDIU OF SA!'FRA!TGISCO CAL TF 

EIGHTH CA FORTSAUHOlJSTON TE..X.~S 

Dcca:iber 2, 1941. 

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O,Q.-~ .:,~~~ _,,.,.. cm.!MANDAJ.!T TIE SIGNAL GORPS SCHOOL FORT MONl!uUTH NJ ~ ~· ~._ ~ a.Q..Q_ ~ ~~Mb!_../ 

EFFECTIVE AT ONCE MONITORif'G srATION WII.L CUPY ALL JAPAJ:ESh P ~IN l'EXT ~ \3 

. kl-.; 

IN ADDITION TO GODE TEXT DIPIDMA'rIG TRAFFIG STOP TFIS TAAFFIC 'W:!:LL RE JFORWARDED WITH REGULo\R TR.ti.F1''IC 

COLTON Acting 

SENT NO. 678, Manila, 12/2 

SEt:r HO. 494, PA!~AMA, 12/2 

SENT NO. 385, 9th Ch, 12/2 

SENT NO. 83, 8th CA, 12/2 

Unnumbered SEin1 FT. MONMOUTH, 12/2 

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REF ID:A488562 

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WAR DEPARTMENT 

OC81g0, Signal Intelligence Service 

/s/ R. w. Minckler, 

R. w. Minckler, Lt.Col.,Signal Corps 

PRIORITY - SEORl!l! 

DECEMBER 7, 1941 

530 FORT SHAFTER TH !

734l SIGNALS MANILA PI 

403 PRESIDIO OF SAN FRANCISCO CALIF 

SEND TO WAR BY PRIORITY ENCIPHERED RADIO ALL JAPANESE CLEAR 

MESSAGES ENDING WITH ENGLISH WORD QUOTE STOP UNQUOTE SPELLED 

REPEAT QUOTE $TOP UNQUOTE SPELLED COPIES SINCE NOVEMBER 

TWENTYSEVEN AND HEREAFTER 

COLTON ACTING 

SENT NO. 734 to Manila, 12/7 

SENT HO. 530 to Hawaii, 12/7 

SENT NO. 403 to Pres. of s.r. 12/7 

COPY 

ATTACHMENT 2 
- -ANDARD l"'OftM NO. I• A 

Alrwusnna~ 

llAllCll It. ... 

- l"ROM1 WAR Dl!ptARTMENT 

~ OCSigO, Signal,Int.alligence Service 

I I 

• 

IM 

' I I ' ' TELEGRAM . . _; ' - :, ,I '· • ·--- ( ,' --~ -- . -- R.W .Minckler, Lt.Col.,Signal Corps Q1111'1CIAL BUSINESS-GOVERNMENT RATES 

PRIORITY - ~R:ET" --- DECEMBER?, 1941 

1~1 SIGN&!§ NIU PI 

,;';:1 V -- --- T SHAFTER TH 

v ~ PRESIDIO OF SAN FRANCISCO CALIF .,,() 3 

SEND TO WAR BY PRIORITY ENCIPHERED RADIO ALL JAPANESE CLEAR MESSAGES 

E~mING WITH ENGLISH WORD QUOTE STOP UNQUOTE SPELIED REPEAT QUOTE STOP 

UNQUOTE SPELLED COPIED SINCE NOVEMBER 'IWENTISEVEN AND HEREAFTER 

S Ef'.:T ·r JC 

SEi:T r-;o: 

SEr,rT r~c. 

OOLTOI ACTING 

734 to l.~nila, 12/7 

S30 to Hawaii, 12/7 

403 to Pres. t§_ Ed~ 

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, 
STANDAl"ID FOl'tM NO. 14A 

APPllOYID IY THI l'llHlllRlllT 

MAlllCH 10. INI 

SEI'"'T' !O. 

• 

504, 12/2 

JAPA~JESE PI.AIN TEXT Dll'LOMJ~TIC TRAFFIC IN ADDrrION TO CODE TEXT WILL 

BE cornm !;Y UOUITORDlG srATIOJJ llii...,."'ECTIVE AT ONCE STOP ALL JAPANF.SE DIPLOMATIC 

TH.i,?FI1! EXCEPT THAT l''ORWARDEU BY SYSTEM THIRTEEN WILL BE FORDRDED BY AIRllAIL '· .. 7 

COLTON Acting 

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