MI7• 357- MI4(f ), responsible for geodesy of the world and liaison with the
Air Survey Committee and the colonial Survey Committee - MI4(g), responsible for collection and indexing of all topographical
information
MI5.The military intelligence designation of the Security Service. In
January 1916, the General Staff was reorganized, including the estab-
lishment of a new Military Intelligence Directorate.MO5subsec-
tions (a) through (d) becameMI6, and (e) through (h) became
subsections of MI5. MI5, under the command ofVernon Kell,was
charged with coordinatingcounterintelligencemeasures and dealing
with counterespionage throughout the British Empire. During World
War I, MI5 had three main branches:
- MI5(f ) (Preventive), headed byEric Holt-Wilson
- MI5(g) (Investigation)
- MI5(h) (Secretariat, administration, and records)
Other branches included MI5(d), responsible for Imperial, Oriental,
and Near East affairs; MI5(c), responsible for port control; and
MI5(e), responsible for military policy on the control of civilian traf-
fic. On 23 April 1917 the Parliamentary Military Secretary Depart-
ment Section 2 (PMS2)—a section of theMinistry of Munitions
originally formed from MI5(f ) on 19 February 1916 to deal with
matters relating to aliens and others working in munitions plants and
auxiliary military establishments—rejoined MI5 as MI5(a). On 1
September 1917 MI5(b) was merged with MI5(d).
On 1 August 1919, after the Armistice, military control of home
ports ceased and overseas stations were put underMI1(c). On 1 Sep-
tember 1919 MI5(a) merged with MI5(f ). On 31 March 1920 MI5
was reorganized again and MI5(f ) became MI5(a), MI5(g) became
MI5(b), and MI5(h) became MI5(o). MI5(p) was the military intelli-
gence designation for the War Department Constabulary before
World War II.MI6.The military intelligence designation of theSecret Intelligence
Service.
MI7.The military intelligence designation in the War Office for the
section responsible for press liaison.