American 6813 Division History October 1945 Page 7

Tony Sale's Codes and Ciphers

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Government Code and Cypher School. In early 1942 Lt. Colonel (then
Captain) S. Kullback toured Bletchley Park, paving the way for the
visit of Lt. Colonel (then Captain) Rof D. Johnson later in the same
year. Based upon the study and reccommendations of Capt. Johnson and
with the approval of the British Foreign Office which controls G. C.
and C. S., the decision was made to send American Signal Corps per-
sonnel to participate in the activities at Bletchley Park. The
first contingent left Washingtom in August 1943 and the last major
party, departed in March 1944. At first these American personnel
were regarded as directly part of Signals Intelligence Division
(Signal Section) Headquarters European Theater of Operations, US
Army , commanded by Colonel George A. Bicher; the varioys individuals
being placed on detached service to Bletchley and billeted in pri-
vate quarters. In late February 1944 the 6813th Signal Security De-tachment was
organised and on 29 Marh 1944 a post opened in the
Manor House at Little Brickhill (Buckinghamshire). The then Captain
Bundy served as the first commanding officer and remained in that
capacity thrughout the operational history of the detachment. Oper-
ations by American personnel at G. C. and C. S. continued until
Victory -in Europe Day at which time the major mission of the party
was completed. The detachment was subordinated to SID (Signal Section)
Headquarters European Theater of Operations, uder Lt Colonel Johnson
who was director of the Special Cryptanalytic Project.


The 6813th Signal Security Detachment has had abn average strength

of 85 officers and men, 20 of these serving in administrative capacity
to maintain the post at Little Brickhill and the remaining 65 in var-
ious assignments at G. C. and C. S. The achievement of administrative
and overhead personnel in providing comfortable quarters at Little
Brickhill does not constitute part of this history but merits grateful
mention in passing.


The operational personnel of the Detachment comprised a body of

technicians concerned with the problem of German cryptanalysis, and
their assignments corresponded to the organisation of that portion of
of G. C. and
C. S.
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