The MI5 British is the United kingdom's domestic Counter- Intelligence and and is a part of it's Intelligence machinery alongside the Secret Intelligence Service (M16), Government communication Head Quarters (GCHQ) and Defense Intelligence's (DI). The MI5 British Intelligence is also a security service and the MI5 British Intelligence's stand s for British Intelligence's Section 5. ( Wikipedia..)
The Security Service is derived from the Secret Service Bureau, founded in 1909 and concentrating originally on the activities of the Imperial German government as a joint initiative of the Admiralty and the War Office. The Bureau was split into naval and army sections which, over time, specialized in foreign target espionage and internal counter-espionage activities respectively. This specialization was a result of the Admiralty intelligence requirements related to the maritime strength of the Imperial German Navy. This specialization was formalized prior to 1914 and the beginning of World War I, with the two sections undergoing a
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Not only is it rewarding and unique but the variety here is like nowhere else. Depending on your job on joining you will find yourself either classed as a specialist or a generalist and belong to a specific capability area. Staff are given significant autonomy to manage their own careers and typically move jobs every two to three years with the option to move across areas. Therefore it is not unusual for someone to have worked in counter-terrorism, recruitment, counter-espionage and corporate communications in the first few years of their career. This variety means that most people stay at MI5 as they are able to fulfill all their career ambitions here and apply for promotion whilst doing so. Your career options can be further enhanced by opportunities to work in regional stations across the UK and secondment opportunities to our partner agencies SIS and GCHQ. (career of a MI5 British Intelligence