.. • ... 

AACS 

.,/ 

• RErtri~;Ji'}d·93o • HEADQUARTERS 

AIR\"lAYS AND AIR COlQ...~ICATIONS SERVICE 

Washington 25, D. c. 

SUBJECT a Weather Cryptographic Equipment 

TO: Chief 0£ Sta£.f 

United States Air Force 

Washington 25, D. C. 

ATTN: Director of Communications 

20 April 1948 

1. This headquarters has reviewed the cryptographic requirements 

for the handling of classified weather traffic in the event of an emergency. Accordingly, it is requested that the following action be 

initiated: 

a. 800 copies of Y~l0-61 and WB-10-62 be produced and 

placed in war reserve for immediate shipment in the event of an emergency and for such stockpiling at Registered Publications Sections of 

this Service as exigencies may demand. 

b. 250 Converter M-228-M's (Short Titles SIGHUAD) or 

equivalent device be rehabilitated for such i.Jrunediate shipment as requirements may demandJ that an additional 350 be earmarked to be made 

available within six (6) months to the advent of an emergency. 

c. Requirements for key lists and rotors will be forwarded 

upon completion of area weather central and dissemination plans. 

2. Action has been taken through supply channels to insure the 

availability of M-131-B2 subsets for Converter M-2.28-111 s set .forth 

in paragraph lb. 

3. These requirements will in no way abrogate or nullify requirements expressed in letter, AACS 413.44/21, dated 27 March 1947, 

SubJect: "Cryptographic Facsimile F.quipment .for Transmission of 

Classified Weather Traffic" or letter, AACS 131, dated 22 March 1948, 

Subject: "Budget for Fiscal Year 1950 - Cryptomaterial. 11 

CONCURRENCE1 

/s/ 

H. M. llcCEELLAND 

MaJor General, United States Air Force 

Commanding 

D. N. n.TES c'"'·····-.:: F) 

Brigadier General, United States A{rvForce 

Chief, Air Weather Service .. .... ... - .. ..,.. r ... • • fP.- 1" I d ~ : ,!; ~ 1-:..J J~ .. ~· \, -· "~~ 

SECRET 

Declassified and approved for release by NSA on 06-02-2014 pursuantto E.O. 1352Q".ir. 
• ... • 

REF ID: A70930,...,,. - = -, • • GECREJ}- 'zt.: "'-,,. ... 

BASICt Ltr fr liq Al~CS, 20 Apr 48, Subj: Weather Cryptographic 

F.quipment 

AGOAS/C 311. 5/3 1st Ind 

.... I',. I, - " ... 

Department of the Air Force, Hq USAF, Washington 25, D. c., 5 May 1948 

TO: Chief', Army Security Agency, Department of the Army, The Pentagon, Washington 25, D. C. 

1. Your attention is invited to basic communication. 

2. This headquarters concurs in the requests set forth in para- graphs la and lb, basic communication. 

3. It is requested that this headquarters be informed of action 

taken by your agency in this matter. 

FUR THE CHIEF OF STAFF: 

CSGAS (10.A.pr •a) 24 lad 

/e/ 

WEtIDELL W. B<l'lHAN 

Colonel, u. s. Air Force 

Deputy Director of Communications 

lrrtelllg•llO• Dl ..Salon, Qeuen.1 Start• O'n1 ted State a Ar1llt • 'lhe Pe~~oa. 

~·-•Jdagton aa. D. c •• II Ila)' 19&1 

1'01 Ohiet of Start. Vnli:ed State1 Air Pone, Jloca G 10'1, 1'he Pentaeon, 

'Waeldngtan Ifie D. c •. &TTlh Dlnotor ot Com.unloat!ou 

:i. t'he e1gh1; Jat.ialr.4 ooμI.•• ot 'tQJ•lo-11 and VfB-lo-62 requeated 1n 

pan.gP!iph 1& ot tU laa1e letter will b• prod.ua.t. p1aoed in lrar i•••ne• 

and w111 be aulla'bl• tor ahl'{IMllt atter 11 Augu1ti lHO. 

2. Ths A1'111 leour1't7 "C•IUIY ba1 under ooutdel'ati~ a. -prapo•ed aod1· 

tloation ot tho pr•••nt ltGBU&u. llltend•d to 1norea1e tblt •eourity ot th1a 

derio•1 and it 1• apMted. that d•wlap•:nt and. te1t1 of thia modU'l•d. SIG-

!TJlD 1'111 'b• ouaplet•4 •bmt 1 A~t; 1948. a.bab11S.tatioc and .aonwra1ou 

of 'he 2&0 and 180 SIGll'UATJ requeat.d :ln PU'lll"Ph l'b will •tart imediatel.J' 

upo11 appl"Oftl ot tbl• propoaed aod1tiaat1on. 
.. 

... • REF ID:A70930 

\ l r.. z rr • 

CSGAS (20 Apr 48) 2d Ind 

SUB.JiCTc 'lf•ther Ceyptographio Equipment (oontinuecl) 26 *1' 1948 

a. In the ewnt an •ergsncy ahould ooour prior to the tlm.e the 

propoaod m.odif'ioatf.on ll approwd. oormanion or SIGC'IJM to SIGRUAD could 

be atartecl i1'llll8diat8ly with an oatimated. output or tl-.lrty SIGll'JAD per •eek. 

, ... -

__ , 

- i' 

/~~--v ~ol.n G. HA.YGS 

Colonel. Slgaal Corp• 

Chiei' • Ar1.fJy Secu:ri ty .lgenoy 

MAY I 'l 1948 

SIGNED AND SENT OUT 
DBAFT 

2d Ind 

TOr Chief ot Statf 1 United Stat.ea A1r Poree, 1fuhington 25, D. c., 

ATTMIOR: l,)1.recto:r of Communication• 

l. The eight hundred copies ot ?IB-10-61 and ~ID-J.0-62 requested 1n 

pangraptl la of the buic letter will be produced., placed in War Baaene, 

and will be available £or shipnent alter lS ~ugust 1948. 

2. The AJW7 Securit7 Agency has under conaideration a pro~sed mditication of tbe present SIGHUAD, int.ended to increase the security of t.hia 

device and it ia cr.peatecl that. develomaent and tests o! this modified 

SICHUAD 1f1ll be completed about l August 1948. fiehabilitation and conversion of the 250 and 350 SIGHU.AD requested in paragraph J.b will atart. 

iauMdiatel,y upon appzoval ot this propo"d modification. 

3. In the event an eaergen.cy should occur prior to t.he time the 

~~.-·) ~ propoaed moditication ia approvod; conversion ot SIGCm! to SIGHUA.D could 

./ . 

.... L~I 

.y· 

~ 

~ ~ ~ 

~ 

~ ,, ..... -~ 

~1 

be ata.rt.od im.':tediate]J' wit.h an estim~ted output of thi.rt.y SIGHUJD per wek • 

SECRET 
• 

5. AS-80 AS~24 8 Oct 47 Lt. Palioca Ext 489 

l. It ie agreed that the basic plan presented in 

Comment 11 above, 1a eound.. Bowever, it is i'elt t1'at to 

broach this eub~ect to AnJ Ground Forces and t1S Ail' 

Force at tt..1.a time might lead to changes in present 

Military Characteristica which could be so reetrictive as to ser1oue~ hamper 

present development. 

2. ·In view of paragraph l, above, it 11 desired that consideration be 

given to the suggeetion that th:la subject 'be inYeetigated by the appropriate 

subcommittee of the Ar1117 Secur1t7.Ageney Technical Co•ittee. 

3. In the event that AS.SO ccnsiders tbe latter approach to be in-

~ppropriate, it ie desired tbet the matter be again discussed with AS-701 

and a proposed draft of a letter to the J.rrq Ground Forces, US Air Force, 

and the Si~l Corps ae agreed upon bf both d1Tision• be eubaitted to this 

office. 

l Inel 

n/c 

' ' 

/a/ Charles H. Hiser 

CHARLES H .. msm 

Lt. Colonel, Signal Corps Acting Deputy Chief 

Army SeauritJ Agenc7 ~t 462 ' 

4 

' . ' - ,, '-' "'l .,.. 

~ ........ ,. ., 
' 

1HBU I AB-24 

6w AS•7t AS•Bl 11 Feb 48 

Jt.t-1u'?I01h •· 'famr Crntograpb1o Paobging 

1. In capliance with paragraph 2 or actlcm. 5 the• llilitary Characteriatioa 

are tonrarded to the ArJllf Security .t.gency ?eclm1oal Coaittee. 

2. lt 1• not believed that tbi• 21 the proper •T ~o handle these Xilitar1 

Characterlatica •1nce it ia i'elt tllat the responaibili'V for tb.e dnelopmnt ot 

tt-.is equiiawnt ahc,uld be uudertaken by th• Signal Corps and that 1 t is not a 

matter for the Army >.iecuri ty Agency Technical Comi t~•. Bowner • a111ce the 

:Lilitai-y Charaoteriatica were pre'8J'ed by thie Agency. 1' 11&• beli9T9d that the 

proper coordination with the Army Ground Forces. the Air Force. and the Signal 

Gorps shoulct be undertaken by thi1 Agency. 

l Incl 

u/c 

f 

""' f 

j - ' I _, 1/ 

, ..... \ 

. , A. SIIIOY 

Chief. Seaurlty D1TiS10Jl 

Ertnai• 2'1 

..... 1-~ ~ .. 11.ir::'\~ 

RE s T li: ;i;; CT g D, ... - J ' ., 11 - -'' 

&