A B C D E F G H I J K L M N O P Q R S T U V W X Y Z N°

UAV	Unmanned Aerial Vehicle
UC	Unassigned Cell
UC	Undercarriage
UCAV	Unmanned Combat Air Vehicle
UDS	Universal Documentation System
UHF	Ultra High Frequency (300 MHz to 3 GHz)
UJ	Unjammed
UJC	Urgency Justification Code
ULSA	Ultra Low Sidelobe Antenna
UPS	Uninterrupted Power Supply
URE	Unintentional Radiation Exploitation
USAF	United States Air Force
U/S	Unserviceable
USAFTFWC	United States Air Force Tactical Fighter Weapons Centre
USB	Upper Sideband
UTC	Coordinated Universal Time (sometimes given as CUT)
UTM	Universal Transverse Mercator
UUV	Unmanned Underwater Vehicle
UV	Unmanned Vehicle