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A-2—US Air Force Intelligence

ASA—Army Security Agency [American]

ASIO—Australian Security Intelligence Organisation

BDS—British Defence Staff, Washington

BfV—West German security service

BJ—‘Blue jacket’ file for signals intelligence or an individual intercept

Blue Book—Weekly digest of comint material for the PM

BND—Bundesnachrichtendienst – foreign intelligence service of West Germany

Brixmis—British Military Mission to the HQ Soviet Army in East Germany

BRUSA—Anglo–American signals intelligence agreement, 1943

‘C’—Chief of the British Secret Intelligence Service (SIS)

CESD—Communications-Electronics Security Department, succeeded by CESG

CESG—Communications-Electronics Security Group

CIA—Central Intelligence Agency [American]

comint—Communications intelligence

comsec—Communications security

CSE—Communications Security Establishment [Canadian]

CSU—Civil Service Union

CX—Prefix for a report originating with SIS

DIS—Defence Intelligence Staff

DMSI—Director of Management and Support for Intelligence in DIS

DSD—Defence Signals Department [Australian], formerly DSB

DWS—Diplomatic Wireless Service

elint—Electronic intelligence

FBI—Federal Bureau of Investigation [American]

GC&CS—Government Code and Cypher School

GCHQ—Government Communications Headquarters

GRU—Soviet Military Intelligence

GTAC—Government Technical Assistance Centre, established in 2000 – later NTAC

IRSIG—Instructions and Regulations concerning the Security of Signals Intelligence [Allied]

JIC—Joint Intelligence Committee

JSRU—Joint Speech Research Unit

JSSU—Joint Services Signals Unit, combined sigint collection units

KGB—Russian secret service

LCSA—London Communications Security Agency, until 1963

LCSA—London Communications-Electronics Security Agency, until 1965

LPG—London Processing Group

MI5—Security Service

MI6—Secret Intelligence Service (also SIS)

MiG—Mikoyan – Soviet fighter aircraft

MoD—Ministry of Defence

MTI—Methods to Improve, sequential five-year sigint programmes at GCHQ

NATO—North Atlantic Treaty Organisation

NSA—National Security Agency [American]

NTAC—National Technical Assistance Centre, previously GTAC

PHP—Post-Hostilities Planning Committee

PSIS—Permanent Secretaries’ Committee on the Intelligence Services

SAS—Special Air Service

SBS—Special Boat Service

SDECE—French intelligence service

Sigdasys—An allied operational sigint distribution system in Germany in the 1980s

sigint—Signals intelligence

SIS—Secret Intelligence Service (also MI6)

SOE—Special Operations Executive

SUSLO—Special United States Liaison Officer based in Britain

TICOM—Target Intelligence Committee dealing with signals intelligence

UKUSA—UK–USA signals intelligence agreements

VHF—Very High Frequency

Y—Wireless interception, usually low-level

Y Section—SIS unit undertaking interception activities

Y Service—Signals interception arms of the three services