Acronyms: U

Acronym	Name
U.S.	United States
UA	Unmanned Aircraft
UA	Unmanned aircraft
UA	Unnumbered acknowledgment
UAM	Urban Air Mobility
UART	Universal asynchronous receiver transmitter
UAS	Uniform Accounting System
UAS	Unmanned Aircraft System
UAS	Unmanned Aircraft Systems
UAS	Unmanned aircraft system
UASFM	UAS Facility Map
UASTB	Unmanned Aircraft System Training Battalion (U.S. Army)
UAT	Universal access transceiver
UATP	Universal air travel plan
UAV	Unmanned Aerial Vehicle
UAV	Unmanned aerial vehicle
UBA	User Benefits Applications
UBI	Uplink block identifier
UBI	User Benefits Infrastructure
UCAV	Unmanned combat aerial vehicle
UCD	Universal cockpit display
UCI	User computer interface
UCR	Unsatisfactory Condition Report
UD	User data
UDF	Unducted fan
UDP	User datagram protocol
UFAS	Uniform Federal Accessibility Standard
UFO	Unidentified Flying Object
UGCS	Universal ground control station
UGDT	Universal ground data terminal
UGS	Unattended ground sensors
UHF	Ultra High Frequency
UHF	Ultra-high frequency
UHF	Ultrahigh Frequency
UI	Unnumbered information
UIR	Upper information region
UL	Underwriters Laboratories
UL	Uplink
ULV	Ultra-low voltage
ULWG	Upper layer working group
UML	Unified modeling language
UMS	Unmanned system
UMTS	Universal mobile telecommunications system
UNIX	Uniplexed Information and Computing System
UP	Universal platform
UPR	User Preferred Route
UPRM	Universal platform resource management
UPS	Uninterruptable Power Supply
UPS	Uninterruptible power supply
UPT	User Preferred Trajectory
URA	Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970
URET	User request evaluation tool
URL	Universal resource locator
USAACE	United States Army Aviation Center of Excellence
USAF	U.S. Air Force
USAF	United States Air Force
USB	Universal serial bus
USC	United States code
USCG	U.S. Coast Guard
USCG	United States Coast Guard
USG	United States Government
USNS	United States Notices to Airmen System
USOAP	Universal Safety Oversight Audit Program
USOC	Uniform Service Order Code
USSOCOM	United States Special Operations Command
UTC	Coordinated Universal Time
UTC	Coordinated Universal Time (ZULU)
UTC	Universal time coordinated
UTM	UAS Traffic Management
UTP	Unshielded twisted pair
UUT	Unit under test
UV	Ultraviolet
UWB	Ultra wide-band
UWS	Urgent Weather SIGMET

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Acronyms: U