I believe the difference is like the FBI and CIA in the USA - one is for domestic intelligence and one is for international intelligence. I also think that some of the other numbers may have been active in intelligence and of the like during the world wars.MI (Military Intelligence) had agencies numbered up to 19, but not all at the same time.Equivalent to the US's CIA (Central Intelligence Agency) NCIS (national criminal investigation squad) are top ranking police officers dealing with high profile crimes, and have little to do with intelligence, though often co-operate with intelligence agencies for practical reasons. Anonymous' contention that NCIS stands for National Criminal Investigation Squad is a load of old tosh.
The FBI does have a counter intelligence section and they work very closely with the CIA and other intelligence agencies in the US like the NIA (Naval Intelligence Agency) and DIA (Defense Intelligence Agency). Some of these are the FBI, DEA (Drug Enforcement Agency, ATF (Bureau of Alcohol, Tobacco, and Firearms), U. diplomatic premises and staff, British companies and investments and British citizens living or travelling abroad.Security threats to British interests anywhere in the world fall within the scope of our functions as set out in the Security Service Act 1989.Equivalent to the US National Security Agency (NSA).MI6 (now SIS) gathers intelligence pertenant to the UK's international affairs - spying on Iraq for example.The author says that the whole series has now been replaced anyway.
MI1-director of military intelligence; also cryptography MI2-responsible for Russia and Scandinavia MI3-responsible for Germany and eastern Europe MI4-Aerial reconnaissance during world war two MI5-domestic intelligence and security MI6-foreign intelligence and security MI8-interception & interpretation of communications MI9-clandestine operations (escape and evasion) MI10-weapons and technical analysis MI11-field security police MI14-German specialists MI17-secretariat body for MI departments MI19-POW debriefing unit Contrary to the above answers likening MI5 to the FBI, that's rubbish too. It has nothing whatsoever to do with the US Intelligence services and is simply the "Federal Bureau of Investigation".
MI13 Reconnaissance MI14 and MI15 German specialists, Mi16 royal secret service MI17 Military Intelligence "Head Office". MI19 Po W debriefing, A full list of Miliary Intelligence (MI) Departments during world war 2 can be found on pages 147 and 148 of "Codebreaker in the Far East" by Alan Stripp, published in 1989 by Oxford University Press.
This goes numerically up to MI19 plus MIL, MIR and MIX.
The NSA is the nearest equivalent to MI5 but GCHQ's role may well overlap in terms of jurisdiction.
GCHQ collaborates with all the British intelligence services on a daily basis, both cross-checking information or providing useful intelligence for the MI community. The Transportation Security Administration also is within DHS.
most british intelligence agencies still remain classified to the general public x the only reason this information has been released is that these agencies have all now terminated activity and new agencies have replaced them. S DG of MI section 25 By-the-way: NCIS stands for National Criminal Investigative Service. Having lived and studied in Amherst, I'm wondering how you can possess such a deep and correct knowledge of matters military while in 'the valley', an area not exactly conducive, but rather hostile, to that region of scholarship. In the United States, NCIS is the Naval Criminal Investigative Service. Now included in the Department of Homeland Security (which was created in 2003) are these federal investigative agencies: CBP (U. myths sections, "SIS (MI6) collects secret intelligence overseas on behalf of the British Government.