144 • DEFENCE GEOGRAPHIC AND IMAGERY INTELLIGENCE AGENCY
the West during the Cold War. Thus, while theCentral Intelligence
Agencygained a steady stream ofKGB(and someGRU) defectors
throughout the 1950s and 1960s,MI5gained no defectors between
the arrival ofGrigori Tokaevin 1948 andOleg Lyalinin 1972, a
failure regarded by themolehunters as evidence of hostile penetra-
tion. Defectors may be debriefed over many years, although their ini-
tial interviews are considered to be the most valuable and the least
likely to be affected by embroidery. Defectors to Great Britain and
the United States may not necessarily be declared publicly at the time
they are granted political asylum, but the intelligence product is usu-
ally shared, and during theresettlementprocess the defector is likely
to be taken on a world tour of allied agencies to make his information
and advice available to othercounterintelligenceexperts.DEFENCE GEOGRAPHIC AND IMAGERY INTELLIGENCE
AGENCY (DGIA).Created by a merger betweenJoint Air Recon-
naissance Intelligence Centreat RAF Brampton and the School of
Military Survey, the DGIA provides maps and imagery. It incorpo-
rates the Defence Geographic Centre at Feltham and the Geographic
Engineer Group, based at Hermitage in Berkshire and Muchenglad-
bach in Germany.
DEFENCE INTELLIGENCE ANALYSIS STAFF (DIAS).Respon-
sible for defense intelligence assessments and strategic warning, the
DIAS is a key component of the Defence Intelligence Staff and is
headed by a civilian deputy chief of defense intelligence.
DEFENCE INTELLIGENCE AND SECURITY CENTRE (DISC).
Created in 1996 and located at what had been RAFChicksands Pri-
oryin Bedfordshire, the DISC provides triservice security and intel-
ligence training.
DEFENCE INTELLIGENCE STAFF (DIS).Created by the amal-
gamation of the triservices into the Ministry of Defence in 1964, the
DIS took responsibility for the collection, collation, analysis, and dis-
tribution of all types of military intelligence. The organization,
amounting to 4,500 civilian and military personnel, with the majority
based at the Old War Office Building in Whitehall, is headed by a