Personal security form for all members of GCCS warning against careless talk, security...

HW 14/36

1942 May 1-15

Personal security form for all members of GCCS warning against careless talk, security incident in Hut 3; GCCS partial staff listing; staffing of AS; case for additional Sigint printer links from BP to Ministries, installation of printer in Hut 3 with links to Broadway, WO, GHQ Home Forces, Admiralty and AM; printer links between Huts 3 and 4; case for reducing machine noise in BP Type X Comcen May 3; minutes of Civil Heads of Sections' meeting at Berkely Street, chaired by AGD, Commercial Section to move to Aldford House on May 4; dispute over removal of RAF officer from Hut 3 to Cdr Saunders' section, AM takes over Hut 3 RAF Section and designates it AI4 (f); details of officers from 6 IS Huts 15 A/B/C allowed to enter Hut 3; C's order to change Hut 3 Sigint Headline Report; WG Welchman's paper on present and future labour requirements in the machine rooms; memo to EWT from Welchman and Colman on future shortage of sets for E when Germans start Russian Front offensive; proportion of Bombe time spent on various German cypher systems; cover control, conflicting priorities; new work for Military Research Section; liaison with customers, priorities of ISK, liaison between SIS Section V and GCCS ISK Section; special Jumbo Jumbo traffic from RSS and Sandridge for Mr Twinn's Section at Elmers School May 7/8, special messenger service from Hut 14 to Elmers School; RSS intercept results; lists of documents available in IE; French agent intelligence reports sent by AD (S) to Major Cowgill of SIS; WRNS wastage during April showing 10 postings out, case for commissioning some BP Wrens; report of German printer usage to date; meeting of Apr 4 attended by FO and PO representatives to discuss performance of PO intercept sites, particularly Sandridge, problems in funding and building new PO Sigint station at Cupar; case for retaining PO Sigint operators eligible for call-up; AM decrees only Gp Capt and above can authorise Emergency and Immediate messages; liaison with Indian Sigint at Abbottabad, with Colombo, with Canada, with South Africa and with Russia, GCCS to send German police traffic to Moscow, Admiralty Sigint operation at Murmansk; letter from AGD to Oliver Strachey in Ottawa with details of French colonial systems; correspondence with CBME, C-in-C ME considers running down Sigint unit in Malta, report on German intentions in Med; Admiralty comments on visit to HMS King George V by S/L Moore of GCCS; Admiralty proposals for standardisation of Sigint terminology and classification; WO MI Directorate organisation; extracts from YC meeting at Broadway on May 6, costs of non-morse Sigint programme, processing of Tunny non-morse material; Sigint report on German seizure of English transmitter, cyphers and 2 Greeks in Salonica

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