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Dear John; 

REF ID:A275303 

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Arlington Hall Station 

Arlii::a.gton, Virginia 18 August 1943 

I was very pleased to receive yoUl' letter or July 25. By this tfnie I BJn sure that you have retUl'ned from your leave and 

I hope that the much needed rest has improved yoUI' health. It 

seems to ae that all of us would profit by taking advantage of 

leave to get away f'l'om the gl'ind. I have not yet been able to 

do so but expect to within a rev days. 

I talked briefly with Joe Wenger on the phone on Sunday, he hav~ng gottep ha.ck the night before. We made & tentative ef.lgR~tnnent to get together and last night when I phoned his 

llOme to st;e it' be vas ava.ilable for a chat, I found that he 

vaS out at the Naval hospitai. I suspect that he will h&ve to 

-e&ke a rest for several weeks. As a matter or fact I had been 

wi>nd.ering how 19Il8 he would. be able to stand. up undex- the strain 

beeause for a niiin.oer o? months nov I have watched him go dovn 

n-o-tieeably. He told me on Sund.&7 that he had been led a merry chase by Admiral Redman but then Red.man has the ph7sique to take 

e; g-ood deal or plllli sfun.en t . 

I turned i~ a very brief preliminary report several weeks 

ago and a eoupl~ or days ago I turned in & detailed report on the 

E operations. It eomes to vell over 100 pages of s1nglewspa.ced typevr1t1ng. A copy is being sent Travis officially. I hope that 

ydu Wl.11 get & chance to see it and that it does not contain too 

itany errors. I plan to submit several additional reports on other 

sttcjects just as fast as I can get them out but you ma.7 well under-

«tand that they have to vritten under pressure and in such time as 

I can steal rrom other work which has to be carried on currently. 

We thought that ve had nearly reached our full and authorized 

strength a rev weeks ago but nov ve find that we are going to 

have to take on a good many more people. our recruiting program1 Vhieh was tem,porarily suspended a couple of weeks ago, is about 

to be reactivated, and I hope we ma.7 be able to find the necessary number among the young women. Our great problem is not so much 

the question.or accommodation as of transportation but with surr~cient pressure I think we can manage. 

Declassified and approved for release by NSA on 07-16-2014 pursuantto E .0. 1352a 
REF ID:A275303 

I va.s very mueh interested in your notes regarding the 

Japaneee problem especially in the question of solution when 

the basic book is unknown and the indicating syatem impregnable. We are soon going to undertake some studies of a theoretical nat~e using newly developed RAM devices or the nature or those 

7ou aav at the Navy. I think the matter will resolve itself 

i.nto one of high speed location of distributed eo1noidences. We 

shall, of eourse, keep in close touch with you. 

q-u:r luck on the current Japanese codes seems to be holding ~· I ~o not want to pat myself on the back, but three years 

ago I contended that the Japanese simply would not be able to 

keep up !ith their fancy indicator system and that the system 

&B a w1:1.ole lttUSt break down sooner or later. No doubt you have 

a1read.y been apprized of the recent discoveries in the case 

er 7890. I do not think that the Japanese will be able to 

tighten up; on ~he contrary, I think it will get progressively 

ea-1Jier. I am r~a1ly hoping that ve will be able to do in the 

case or the operations what has been done at BP on E operations, in respect to speed and practical results. 

I shall be extremely interested in the results of your ~xperiment vith 3'66 on new lines. Please let me hear from you the minute you have anything to report. 

Colonel Corderman, aa you lal.ow, is planning to pay you a 

visit next month. He bas read '11fY E report most attentively and says he is going to go over it tvo or three times so that 

he ll.as a complete picture seen through my eye8. I hope that 

I v111 have several other reports out before -e leaves. I think 

that he will be able to get more out or his visit that way. 

I bad quit& a talk with Admiral Redman a few days ago after he retUl'ned. Re was very enthusiastic about the show at 

BP and at all the other places he visited. Wenger also, in my brief telephone talk Yith him., expresBed his great admiration 

tor the scope and broad concept of things that he saw there. 

I am most anxious to talk over details with him. 

You Yill r&c&ll that ve discussed briefly the desirability 

ot 70~ paying us another vieit this autumn. I am indeed con- ~ineed that these exchange visits are e~tremely benetiei&l and 

I wouJd like to urge that you do come shortly after Colonel Corderma.~ retUl'ns. I think you knoY without my saying so how 

warm a welcome you would receive, 

I see O'Connor very occasionally. He has not yet been 

able to get thoroughly settled in his new house, having had 
REF ID:A275303 

to move out of' one vithin a f'ew weeks after he got into it. 

We have met Mrs. O'Connor and like her very much. 

In his spare time Stevens has prepared a.n interesting and inf"orma.1 discussion of' ~ethods of attaeking the Japanese military codes and I am looking f'orward to reading it. No 

doubt you will receive a eopy from him. 

My best greetings to Mrs. Tiltme.n and to your daughter. Tell Mrs. Tiltme.n that we are glad th.at she liked the trinket. 

With cordial greetings to everybody, I am 

Oolonel J. H. Tiltma.n, 

GC & CS 

Bineerely yours, 

William. F. Friedman 

Director of' Communications 

Research