A

AA - Air Attache: Anti Aircraft Fire
AAC - Army Air Corps:
AAC - Anti Aircraft Co-operation
AACC - Army Air Corps Center
AACF - Anti-aircraft Co-operation Flight
AACTDC - Army Air Corpse Tactical Development Center AACU - Anti Aircraft Co-operation Unit
AAEE - Aeroplane and Armament Experimental Establishment
A&AEE - Aero plane& Armament Experimental/Evaluation Establishment
AAF - Auxiliary Air Force/Anti Aircraft Flight
AAFCE - Allied Air Forces Central Europe
AAFNE - Allied Air Forces Northern Europe
AAFSE - Allied Air Forces Southern Europe
AAGS - Air Armament & Gas School
AAITS - Airmen Aircrew Initial Training school
AANS - Advanced Air Navigation School
AAP - Air to air Missile
AAP - Aircraft acceptance Park (during WW1)/ Army Aircraft Park
AAPC - Anti Aircraft Practice Camp
AAR - Air-to Air Refueling
AAS - Air Armament School
AASF - Advanced Air Striking Force (1939/40)
AATE - Air Armament trials Establishment
AATT&DC - Army Air Transport Training & Development Center
AAU - Air Ambulance Unit/Aircraft Acceptance Unit/ Aircraft Assembly Unit
ABGS(ME) Air Bombing & Gunnery School (Middle East)
AFEE - Airborne Forces Experimental Establishment
AATTF - Anti-Aircraft and Target Towing Flight
ABC - Airborne Cigar - transmitter aboard aircraft which jammed German fighter control frequencies
ABTF - Air Bombing Training Flight
A/C - Aircraft
AC - Aircraftman
AC1 Aircraftman First Class
AC2 Aircraftman Second Class
ACAC - Aircrew Allocation Center - Brackla (1944)
ACATC - Air Cadets Adventure Training Center (Llanbeder and Windermere)
A/Cdre - Air Commodore
ACC - Army Co-operation Command
ACC - Allied Control Commission
ACC - Air Control Center
ACC - armoured car company
ACCF - Army Co-operation Command Communication Flight
ACDC - Aircrew Despatch Center (Heaton Park)
ACDW - Air Crew Disposal Wing
ACGFSOC - Air Cadet Gliding Flight Safety Officer's Course
ACCGS - Air Cadet Central Gliding School (RAF Syerston)
ACDU - Army Co-operation Development Unit
ACDU (ME) - Air Combat Development Unit (Middle East)
ACF - Air Command Far East
ACFAWF - Air Command Fare East All Weather Flight
ACFSS - Air Cadets Flying Scholarship Scheme
ACGS(OR) - Assistant Chief of the General Staff (Operational Requirements)
ACH Air Craft Hand
ACH - Advanced Chain Home
ACHU - Aircrew Holding Unit (No 1 Kidlington, No2 Penhros, No3 Pembray, No4 Grange, No7 Blyton, No8 Rufforth, No9 Gamston, No10 Burn, No11 Bruntingthorpe, No14 Millom. No15 Beccles, No 21 Filey No 22 Kirkham, No25 Aldermaston, No26 Market Harborough, No29 Witchford)
ACIs - Air Council Instructions
ACO - Advanced Chain Overseas (radar)
ACO - Air Cadet Organisation
ACM - Air Chief Marshal
ACP - Air Cadet Publication (derived from APs)
ACPNTS - Air Cadets Pilot Navigation Training Scheme
ACR - Airfield Control Radar
ACRC - Air Crew Reception Centre - (No3 ACRC St John's Wood, London - Regent's Park, London) (1 ACRC - Babbacombe)
ACRC (ME) - Air Crew Reception Centre Middle East (No. 1 ACRC (M.E.), Jerusalem (No. 5 ACRC (M.E.), Helipolis
A.C.R.C - (No 1 ACRC Babbacombe, No 2. ACRC, RAF Sale, No 6 ACRC Scarborough)
A.C.R.C - Aircrew Receiving Centre (No 4 Filey, No 7 Torquay)
ACRS - Air Crew Refresher School
ACS - Airfield Construction Squadron
ACSB - Air Crew Selection Board (No 7 ACSB Cardington)
ACSEA - Air Command South East Asia
ACSEA/ASS - Air Command South East Asia Air Service Squadron ACTC - Air Cadet Training Centre (at RAFC Cranwell)
ACU - Air Conditioning Unit
AD - Aircraft Depot
AD - Air Defence
AD - After duty (used on F259 for start of leave period.)
ADC  - Air Defence Centre/Aide de Camp
ADCC - Air Defence Cadet Corps (established 1938, see ATC)
ADCS - Air Defence Cooperation Squadron
ADEM - Air Defences Eastern Mediterranean
ADF(U) - Aircraft Delivery Flight (Unit)
ADGB - Air Defence of Great Britain
ADGE - Air Defence Ground Environment
ADLS - Air Despatch Letter Service
ADM - Air Defence Missile
ADRU - Air Despatch& Reception Unit
ADU - Aircraft Delivery Unit
AE - Air Efficiency award
AEAES - Air Electronics& Air Engineers School
AEAF - Allied Expeditionary Air Forces
AEC - Assessment& Evaluation Centre
AED - Aircraft Equipment Depot
AEF - Air Experience Flight
AES - Air Electronics School/Armament Experimental Station
AEW - Airborne Early Warning
AFC - Air Force Cross
AFC - Australian Flying Corps
AFDE - Air Fighting Development Establishment
AFDS - Air Fighting Development Squadron, part of CFE
AFDU (S)- Air Fighting Development Unit/Squadron
AFE - Airborne Forces Establishment
AFEE - Airborne Forces Experimental Establishment
AFG - Air Forces Gulf
AFHQ - Airfield Headquarters
AFM - Air Force Medal
AFRU - Advance Flying & Refresher Unit
AFS - Advanced Flying School - No.201 Swinderby (1948)
AFS - Auxiliary Fighter Squadron
AFSI(I) - Advanced Flying School (India)
AFS(ME) - Advanced Flying School (Middle East)
AFTCC - Air Force Troop Carrier Command
AFTDU - Airborne Forces Tactical Development Unit
AFTS - Advanced Flying Training School
AFTU - Advanced Flying Training Unit/Air Firing Training Unit
AFU - Advanced Flying Unit (No 2 AFU RAF Millom)
AFWE - Air Forces Western Europe
AG - Air Gunner
AGBS - Air Gunnery & Bombing School
AGL - Air Gun Laying
AGME - Aircraft Gun Mounting Establishment
AGRS - Advanced Ground Radio School (No. 2 RS, Yatesbury)
AGRS - Air & Ground Radio School
A&GS -Armament & Gunnery School
AGS - Aircrew Grading School
AGS - Air Gunners School (1 AGS = RAF Pembrey 2AGS = RAF Dalcross 3 AGS = RAF Castle Kennedy from June1941 to dec 1942 then moved to RAF Mona then back to Castle Kennedy10/43, 7 AGS =
Stormy Down 8 AGS = Evanton 9AGS = Llandwrog 10AGS = Castle Kennedy (moved to Barrow - date not known)
11 AGS = Andreas, Isle of Man (moved to Jurby - date not known ) 12 AGS = Bishop's Court)
AGS(ME/I) Air Gunners School (Middle East/India)
AGT - Air work& General Trading (part of the CRO)
AGT - Advanced Gliding Training (Air Cadets)
AGU - Air work Grading Unit
AHQ - Air Headquarters
AHQ(I) - Air Headquarters (India)
A&IEU - Armament & Instrument Experimental Unit
AI - Airborne Interception - night fighter radar equipment
AICF - AI Conversion Flight
AIEU - Armament and Instrument Experimental Unit
AIS - Air Interception School
AITF - AI Training Flight
ALG - Advance Landing Ground
ALS - Air Landing School (India)
ALO - Air Liaison Officer
AM - Air Marshal
AM - Air Ministry
AMDP - Air member for development & Production
AMES - Air Ministry Experimental Station
AMESS - Air Ministry Experimental Station (ground Radar Station)
AMMF - Air Ministry Meteorological Flight
AMO - Air Ministry Order/ Air Movement Order
AMSDU - Air Ministry Servicing Development Unit
AMWD - Air Ministry Works Department
ANBS - Air Navigation & Bombing School
ANS - Air Navigation School
AOC - Air Officer Commanding
AOCU - Andover Operational Conversion Unit
AOG - Aircraft On the Ground (unfit to fly)
AONS - Air Observers Navigation School
AOP - Air Observation Post
AORG - Army Operational Research Group
AOS - Air Observers School (No 4 AOS West Freugh)
AOTS - Aircrew Officers Training School
AP - Aircraft Park
AP - Air Publication
APC (S) - Armament Practice Camp (Station)
APCS - Aden Protectorate Communication Squadron
APCS & SS- Aden Protectorate Control & Support Squadron
APDU - Air Photography Development Unit
AP&DU - Aircraft Preparation& Development Unit
APF - Air Pilotage Flight
APS - Air Pilotage School/Armament Practice Station
APSF - Aden Protectorate Support Flight
APU - Aircraft Preparation Unit
ARC - Aircrew Recruiting Centre/Aircrew Reception Centre
ARD - Aircraft Repair Depot
ARF - Aircraft Repair Flight
ARF - Air Radar Fitter
ARP - Aircraft Repair Park
ARS - Aircraft Repair Section
ARU - Aircraft Repair Unit
ARWF/S - Advanced Rotary Wing Flight/Squadron
A/S - Anti Submarine
ASC - Aircrew Selection Centre
ASC - Air Support Command
ASD - Aeroplane Supply Depot
ASF - Air Survey Flight
ASF - Aircraft Servicing Flight
ASI - Air Speed Indicator
ASM - Anti Submarine Missile
ASP - Air Stores Park
ASR - Air Sea Rescue
ASR&CF - Air Sear Rescue & Communication Flight
ASRF - Air Sea Rescue Flight
ASRTU - Air Sea Rescue Training Unit
AS&RU - Aircraft Salvage & Repair Unit
AS - Air School
ASS - Air Signals School
AST - Air Service Training (CRO)
ASTOR - Airborne Stand-Off Radar
ASU - Aircraft Storage Unit
A/S - Anti Submarine
ASV - Airborne Surface Vessel, radar for maritime patrol aircraft
ASWDU - Air-Sea Warfare Development Unit
ATA - Air Transport Auxiliary
ATAF - Allied Tactical Air Force
ATC - Air Traffic Control
ATC - Armament Training Camp/Air Training Corps (succeeded ADCC, 1941)
ATDC(I) -Air Transport Development Centre (India)
ATDF - Air Transport Development Flight
ATDU - Air Torpedo Development Unit? Air Transport Development Unit
ATF - Autogiro Training Flight
ATFERO - Atlantic Ferry Organisation
ATGU - Aircrew Testing & Grading Unit
ATP - Advanced Training Poll/Aircrew Transit Pool/Air Transit Pool
ATS - Auxiliary Territorial Service (women)
ATS - Armament Training Station/Air Training Squadron
ATTDU - Air Transport Tactical Development Unit/Armament Training Unit/Aircrew Transit Unit/Air Trials Unit
ATREL - Air Transportable Reconnaissance Exploitation Laboratory
ATU - Armament Training Unit/Aircrew Transit Unit/Air Trials Unit/Advanced Training Unit
AUAS - Aberdeen University Air Squadron
AUBDS - Anti U-boat Devices School
AVG - American Volunteer Group
AVM - Air Vice Marshal
AW - Armstrong Whitworth
AWDS - All Weather Development Squadron
AWF - Air Wireless Fitter
AWF - Air Warfare Centre/All weather Flight
AWFCS - All Weather Fighter Conversion Squadron
AWOCU - All Weather Operational Conversion Unit
AWOL - Absent Without Leave
AWRE - Atomic Weapons Research Establishment

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