2310: Beyond MI5 and MI6...Even MI19 Apr 13, 2021

The UK's Directorate of Military Intelligence, beginning in its earliest stages by 1873, the only remnants of which are the MI5 (mostly domestic: counter-terrorism, counter-espionage and military police) and the MI6 (monitoring economic intelligence and arms trafficking). Not only were there at other points MI1-MI4, but all the way up to MI19. Primarily these operated during WWII, and were either completely dissolved (such as MI14 used to monitor Germany through aerial photography and messenger pigeons in WWII), merged into other organizations altogether, or in the case of MI3, MI8, and MI10, merged with MI6 in the 1940's. MI13 was never used.