BEM: British Empire Medal
BER: Beyond Economical Repair
BFTS: British Flying Training School
BGT: Basic Gliding Training
BHFU: BloodHound Firing Unit
BHSU: BloodHound Support Unit
BLDU: Blind Landing Development Unit
BLEU: Blind Landing Experimental Unit
BLS: Bombing Leaders School
BMH: British Military Hospital
BoB: Battle of Britain
BobMF: Battle of Britain Memorial Flight
BRD: Base Repair Depot
BSDU: Bomber Support Development Unit
BSRU: Base Signal Radar Unit
BSTU: Bomber Support Training Unit
BTU: Bombing Trials Unit
BU: Broken Up
BWF: Bristol Wireless Flight
C: Coastal
C&E: Communication and Electronic
C&M: Care and Maintenance
CA: Controller, Aircraft
CAACU: Civilian Anti-Aircraft Co-operation Unit
CACF: Coast Artillery Co-operation Flight
CACS: Central Air Command Section
CACU: Coast Artillery Co-operation Unit
CAEU: Casualty Air Evacuation Unit
Cal Flt: Calibration Flight
Cam-ship: Catapult-armed Merchant ship
CAMO: Camouflage Unit
CANS: Civil Air Navigation School
CAOS: Combined Air Observers School
Cap: captain
CARD: Central Aircraft Repair Depot
CASEVAC: casualty evacuation
CASTS: Combined Anti Submarine Tactical School
Cat: Category
CAT: College of Air Training
CATCS: Central Air Traffic Control School