What Does MI5 Stand For?

MI5 is the name of the Security Service. The Security Service is derived from the Secret Service Bureau. It was established in 1909. MI5 means 'Military Intelligence [Department] 5.' It also means 'Military Intelligence section 5'.MI5 is the British counter Intelligence and security agency.

The main aim of the Secret Service Bureau was to control secret intelligence operations in the UK and overseas. The Bureau was split into Naval and Army sections.

The function of MI5 is to protect the United Kingdom from terrorism and to fight against serious crime. It is totally related with the internal security.

MI5 is known as Box within the government community. It is a civilian agency that has no excecutive powers. MI5 was the Service's official name only for thirteen years.

The Security Service was founded as the 'Home section of the Secret Service Bureau'. Then it became 'Directorate of Military Operations, section 5 (MO5), then it became 'Military Intelligence section 5'(MI5),
Then it became 'Defence Security Service' and then it became 'Security Service'.

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