DGI
CNI
The French use four letters. Damn.

WGB
RUR
AOK

3 letter soup.
As in "intelligence".
Like-
DGI=Direccion General de Inteligencia (Fidel's boys)
CNI= Centro Nacional de Inteligencia(Tango is their thing)
etc, etc

World Intelligence and Security Agencies

Doh!
DIO
DSD
AFP
DIW
ONA

MAD

BND

TLA

BLF
KLM
TLC
XTC
KLF

V=IR

Such a kawaii intelligence!

Let's have a memory for KGB. After all, it left us Vlad the Impaler in Moscow.

EAB

EAB7 in some circles.

NEW ZELAND! Get outta here!

I like Vlad. Most people dont so thats a plus in my book. He told all the foreigners who thought they would pick Russia clean to go to hell, he'll do it himself.

EAB
Hey!
I like these guys!
"Compared with most parts of the public service, EAB is an unusual organisation. It has no role in providing policy advice to the government and no operational functions, and nor does it provide services to the public. Its mandate is sharply defined:
EAB’s role is to provide assessments, not advice. This means that it seeks to explain events and developments overseas, but it does not offer advice on what actions the government might take. (That function lies with policy departments such as the Ministry of Foreign Affairs and Trade, the Ministry of Defence, and many others.) EAB’s work needs to be relevant to the policy issues with which the government is dealing, and to help inform the decision-making process, but the Bureau does not itself engage in policy advocacy;
EAB assesses only external issues, not domestic ones. Though there are often overlaps (in areas, for example, such as transnational organised crime and transnational human and animal health matters), the Bureau deals only with the overseas dimension, while other departments and agencies cover domestic policy and operational matters".

HSS
PdC
CSS
KRF
etc.

TFM

(Alexei Sayle reference)