A few more to add to the list:
ABCA Army Bureau of Currrent Affairs
ACG Army Chaplain General
ADC Aide de Camp
ADGB Air Defence of Great Britain
AEAF Allied Expeditionary Air Force
AFHQ Allied Forces Headquarters
AG Adjutant General
AHQ Army Headquarters (India)
ALFSEA Allied Land Forces South East Asia
AMGOT Allied Military Government of Occupied Territories
AMQ Assistant Quartermaster General
ATC Air Training Corps
BAOR British Army of the Rhine
BEF British Expeditionary Force
BGS Brigadier General Staff
BMM British Military Mission
BRA Brigadier Royal Artillery
BRAC Brigadier Royal Artillery (Canada)
CAS Chief of the Air Staff
CCRA Commander, Corps of Royal Artillery
CCRE Commander, Corps of Royal Engineers
CCRSigs Commander, Corps of Royal Signals
CGS Chief of the General Staff
CID Committee of Imperial Defence
CIGS Chief of the Imperial General Staff
C-in-C Commander-in-Chief
CMF Central Mediterranean Force
CMO Chief Medical Officer
COS Chief of Staff
COSSAC Chief of Staff to Supreme Allied Commander
CRA Commander Royal Artillery
CRE Commander Royal Engineers
CSO Chief Staff Officer
DAAQMG Deputy Assistant Adjutant and Quartermaster General
DAAG Deputy Assistant Adjutant General
DAQMG Deputy Assistant and Quartermaster General
DADMS Deputy Assistant Director of Medical Services
DADOS Deputy Assistant Director of Ordnance Services
DADQ Deputy Assistant Director of Quartering
DADST Deputy Assistant Director of Supplies and Transport
DAG Deputy Adjutant General
DAQMG Deputy Assistant Director of Quartering
DCIGS Deputy Chief of the Imperial General Staff
DDME Deputy Director of Mechanical Engineering
DDMI Deputy Director of Military Intelligence
DDMO Deputy Director of Military operations
DDMS Deputy Director of Medical Services
DDMT Deputy Director of Military Training
DDST Deputy Director of Supplies and Transport
DFC Distinguished Flying Cross
DME Director of Military Engineering
DMI Director of Military Intelligence
DMO Director of Military Operations
DMS Director of Medical Services
DMT Director of Military Training
DQMG Deputy Quartermaster General
DSM Distinguished Service medal
DST Director of Supplies and Transport
ENSA Entertainment National Services Association
GOC General Officer Commanding
GOC-in-C General Officer Commanding-in-Chief
GSO General Staff Officer
IA Indian Army
IAC Indian Armoured Corps
IAMC Indian Army Medical Corps
IDC Imperial Defence College
IEF Indian Expeditionary Force
IMS Indian Medical Service
KAR King's African Rifles
MC Military Cross
MEF Middle East Force
MELF Middle East Land Forces
MGA Major General in charge of Administration
MGGS Major General - General Staff
MGO Master General of the Ordinance
NAAFI Navy, Army and Air Force Institutes (sacrilege to leave this out
)
OCTU Officer Cadet Training Unit
[
OIC should be corrected to O i/c Officer in Charge]
PMA Personal Military Assistant
POW Prisoner of War
QMG Quartermaster General RADC Royal Army Dental Corps
RARO Regular Army Reserve of officers RGA Royal Garrison of Artillery
RMA Royal Military Accademy
RMC Royal Military College (Sandhurst)
RN Royal Navy
SEAC South East Asia Command
SEALF South East Asia Land Forces
SHAEF Supreme Headquarters - Allied Expeditionary Force
SHAPE Supreme Headquarters - Allied Powers Europe
SME School of Military Engineering
SRO Supplementary Reserve of Officers
VC Victoria Cross
VCIGS Vice Chief of the Imperial General Staff
VQMG Vice Quartermaster General
WO War Office
Peter G