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UAC Upper area control centre

UDF UHF direction finding station

UFN Until further notice

UHF Ultra high frequency (300 to 3000 MHz)

UIC Upper information centre

UIR Upper information region

UNL Unlimited

UNREL Unreliable

U/S Unserviceable

USAFE US Air Force – Europe

USAEUR US Army – Europe

UTA Upper control area

UTC Co-ordinated Universal Time