SPECIAL INTELLIGENCE SERVICE• 507
telligence Service (SIS), linked to Whaddon Hall in
Buckinghamshire by radio. Originally namedSpecial Signals Unit
1, Whaddon Hall was designated SCU 1. SCU 2 was a pair of mobile
stations attached to the British Expeditionary Force and after the
evacuation from Dunkirk in May 1940 was assigned to Delhi. SCU
3 was the Radio Security Service headquarters. SCU 4 was Heliopo-
lis in Egypt. SCU 5 and SCU 6 were SIS stations in Algiers and the
Mediterranean. SCU 7 was the Section VIII training center and work-
shops at Little Horwood. SCU 8 was created to channelultramate-
rial to the forward military commands in Europe afterD-Day. SCU
9 was created to connect 21st Army Group with SIS field agents and
sussexteams and consisted of two radio trucks that deployed to Nor-
mandy, spent six weeks in Paris, then moved up to Brussels, and in
September 1945 settled in Bad Salsuffen. SCU 11 was formed at
Sarafandand was eventually based in Delhi. SCU 12 in Calcutta
communicated with agents inBurmaand maintained contact with
the SIS station in Kunming. SCU 13 was intended to deploy to Singa-
pore. Other SCUs were attached to General Dwight D. Eisenhower
mobile headquarters (on his personal train), to the prime minister
whenever he traveled abroad (with Edgar Harrison as his personal
operator), and to the Dutch intelligence headquarters at Eindhoven.
The SCUs were dismantled in 1946 and the personnel and equipment
inherited by theDiplomatic Wireless Service.
SPECIAL COUNTERINTELLIGENCE UNITS.Prior to the inva-
sion of Europe in June 1944, theSecret Intelligence Serviceand
U.S.Office of Strategic Servicescooperated to develop small teams
of indoctrinated personnel who were sent into recently liberated areas
to identify, detain, and exploit enemystay-behind networks. The
SCI units were guided to particular people or locations by informa-
tion acquired fromiskandisosintercepts with the objective of per-
suading the captured spies to participate in adouble crossoperation
supervised by 21st Army Group.
SPECIAL INTELLIGENCE SERVICE.Created in 1941 by the di-
rector of theFederal Bureau of Investigation(FBI), J. Edgar Hoo-
ver, the FBI Special Intelligence Service deployed 360 special agents
to various Latin American countries during 1942 under commercial