O

OADF/U - Overseas Aircraft Delivery Flight/Unit
(O)AFU - Observers Advanced Flying Unit (No10 (O) AFU - Dumfries.
OANS - Observers Air Navigation School
OAPU - Overseas Aircraft Preparation Unit
OAR - Obusna Aeroplansva Radionica, (District Aviation Workshop)
OATS - Officers Advanced Training School
(O)ATU - Observers Advanced Training Unit Oblt - Oberleutnant
Obs - Observation (USAAF)
OBS - Observer School
OC - Officer Commanding (or CO)
OCTU - Officer Cadet Training Unit
OCU - Operational Conversion Unit
OEU - Operational Evaluation Unit
OIC - Officer's Initial Course (for RAFVR (T) officers, conducted at ACTC)
OO - Orderly Officer
OP: -Operation
OFU - Overseas Ferry Unit
OP - Observation Post
Op - Operator
Opl - Operational
ORB - Operations Record Book (Form 540), monthly summaries: Form 541 for accompanying Appendices containing important details of specific events
ORS - Operational Research Section
ORTU - Operational & Refresher Training Unit
OS - Observers School
(O)SoAG - Observers School of Reconnaissance& Aerial Gunnery
OSC - Officers Senior Course (for RAFVR (T) officers, conducted at ACTC)
OSC - Overseas Staff College
OSR&AP - Observers School of Reconnaissance& Aerial Gunnery
OTSCU - Officer Training School Conversion Unit
OTU - Operational and Refresher Training Unit
OTW - Operational Training Wing
OUAS - Oxford University Air Squadron

P

PACT - Pre Aircrew Training
PAF - Polish Air Force
(P)AFU - Pilots Advanced Flying Unit (No. 2 Brize Norton, No. 3 South Cerney, No. 5 Ternhill, No. 6 Little Rissington, No. 7 Peterborough)
PAR - Precision Approach Radar
PAS/U - Pilotless Aircraft Section Unit
PATP - Packed Aircraft Transit Pool
PCCS - Protectorate Communication & Support Unit
PD - Packing Depot
PDC - Personnel Despatch Centre (No 1 West Kirby, No2 Wilmslow, No 5 Padgate Dec1941 Sept.-1945, No 5 Blackpool Feb 1946 - Aug 1950 , No 11 Padgate July 1944, No 11 (RAAF Brighton and Charmy Down May 1943 - March 1946, No12 Padgate, No11 RAAF Brighton/Charmy Down, No 101 Kirkham May - Dec 1945, No 102 Cardington May 16945 - Sept 1946, No103 Long Kesh, No 104 Hednesford, No105, Wythall, No121 Ramleh)
PDC - Port Defence Committee
PDRC - Personnel Dispatch and Reception Centre
PDS - Post Design Services
PDU - Personnel Dispersal Unit (No. 5 PDU, Innsworth)
PDU - Photographic Development Unit
PEE - Proof & Experimental Establishment Shoeburyness
PEFTS - Polish Elementary Flying Training School
PES - Parachute Exercise Squadron
PF - Practice Flight
PFF - Pathfinder Force
PFFNTU - Pathfinder Force Navigational Training Unit
PFS - Parachute Flying Section/Primary Flying School
PFTS - Polish Flying Training School
PFU - Practice Flying Unit
PGTF - Polish Grading & Testing Flight
PGTS - Parachute& Glider Training School
PHU - Personnel Holding Unit
PI - Practice Interception
PIU - Photographic Intelligence Unit
PMC -Personnel Management Centre, President of the Messing Committee.
P/O - Pilot Officer
POR Personnel Occurrence Records
POTU - Polish Operational Training Unit POW - Prisoner of War
PPF - Parachute Practice Flight
PPI - Plan Position Indicator (Rotating radar display)
PPP - Pupils Pilots Pool
PR - Photographic Reconnaissance
PRC - Personnel Reception Centre (No3 Bournemouth, No7 Harrogate/Market Harborough 1942/46, No 29 Drigh Road, Sind 1942 Mar.-1945 July, No30 Ambala, No106 Cosford, No108 Cosford)
PRDU/E - Photographic Reconnaissance Development Unit/ Establishment
PRFU/S - Pilots Refresher Flying Unit/School
PRTU - Pilot Refresher Training Unit
PRRP - Pilots Reserve & Reinforcement Poll (Middle East)
PSI - President of the Service(s?) Institute, hence PSI Funds
PRU - Photographic Reconnaissance Unit/Pilot Replacement Unit
PRU - Personnel Reception Unit (29 PRU Drigh Road)
PS - Parachute School
PSP - Perforated Steel Planking (for runways)
PTC - Parachute Training Centre/Personnel Transit Camp
PTC - Personnel Transit Centre (No 4PTC - Liverpool July 1941 - Feb 1946, No 6 PTC - Endsleigh Hotel, London 1942 Sept.-1947 Feb, No7 PTC - Chittagong 1944 Apr.-1945 Sept, No 8 PTC - Ratmalana 1946 Feb.-June, No 10 PTC - Glasgow 1942 Sept.-1946 Apr, No 14 PTC - 2nd T.A.F. 1944 Feb.-1945 Oct, No16 PTC - Nyetimber 1944 Mar.-July, No 17 PTC - 2nd T.A.F. 1944 Jan.-1945 Nov, No19 PTC - R.A.F. Station, Hethel 1948 Jan.-Apr, No 20 PTC - H.M.S. GOSLING, Warrington 1945 Apr.-Oct, 21 PTC - Kasfareet 1942 July-1945 Dec, 22 PTC - Almaza 1941 Dec.-1945 Dec, No23 PTC - Helwan 1941 Nov.-1943 Aug, No 24 PTC - Aboukir 1942 July-1945 Dec, No 25 PTC - C.M.F. 1942 July-1945 Jan, No26 PTC - Habbaniya later Rangoon 1942 Mar.-1946 Nov, No27 PTC - Shaibah and Margil, Basrah 1942 Sept.-1944 June, No28 PTC - Hadera 1942 Sept.-1944 July, No36 PTC - Hastings, West Africa 1943 Mar.-1945 July, No37 PTC - Accra, West Africa 1943 Aug.-1944 Mar, No 38 PTC - C.M.F. 1943 Apr.-1946 June, No39 PTC - Shallufa 1943 Mar.-1945 June, No40 PTC - Almaza and Aleppo, C.M.F. 1943 July-1945 Oct, No53 PTC - Santo Spirito, Bari 1944 Sept.-1946 Mar, No54 PTC - Taranto 1944 Sept.-1946 Jan, No55 PTC - Fort De L'eau 1944 Nov.-1946 Apr, No 60 PTC - Trichinopoly 1945 Aug.-1948 June, No64 PTC - Madras 1945 Nov.-1948 Apr)
PTF - Parachute Test Flight
PTI - Physical Training Instructor
PTS - Parachute Training school/Squadron/ Section
PTU - Parachute Test Unit/ Parachute Training Unit
PTURP - Pilots Training Unit & Reinforcement Pool (see also TURP)
PV   - Positive Vetting
PWF - Psychological Warfare Unit
PWR - Personnel Warning Roster

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