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U

UI —  US —  UT

ACRONYM	DEFINITION	CONTRIBUTOR
U.K.	United Kingdom	CASI
U.S.	United States	CASI
U.S.S.R.	Union of Soviet Socialist Republics (Now CIS)	CASI
U/V	Under Voltage	Goddard
UA	University of Arizona	Goddard
UAF	Universe Astronautics Foundation	CASI
UAF	University of Alaska, Fairbanks	CASI
UAI	Use As Is	Goddard
UAIC	Unified Aerodynamic Influence Coefficient	CASI
UAM	Urban Air shed Model	Goddard
UARP	Upper Atmosphere Research Program	Goddard
UARS	Upper Atmosphere Research Satellite	CASI
UART	Universal Asynchronous Receiver/Transmitter	Goddard
UAS	Urgent Action Survey	Goddard
UASE	UARS Airborne Support Equipment	Goddard
UAV	Uninhabited Aircraft Vehicle	STIPO
UAV	Unmanned Aerial Vehicle	CASI
UBA	Umweltbundesamt (Federal Office of Environment)	CASI
UBV	(UltravioletBlueVisual in astronomy)	CASI
UBVRI	(Refers to five stellar colors: ultraviolet, blue, violet, red, and infrared)	CASI
UC	University of California	Goddard
UCAID	University Corporation for Advanced Internet Development	CASI
UCAR	University Corporation for Atmospheric Research	Goddard
UCB	Ultraviolet Coronal Berkeley	Goddard
UCB	University of California at Berkeley	Goddard
UCB	University of Colorado-Boulder	Goddard
UCD	Urine Collection Device	CASI
UCLA	University of California Los Angeles	Goddard
UCOS	Universal Checkout Stations	Goddard
UCSB	University of California, Santa Barbara	Goddard
UCSD	University of California, San Diego	Goddard
UDE	Underwater Detection Establishment (Great Britain)	CASI
UDETA	Unsymmetric Diethyltrianine	CASI
UDF	Unit Development Folder	Goddard
UDK	Environmental Data Catalog (Umweltdatenkatalog)	CASI
UDL	Unique Data Log	Goddard
UDMH	Unsymmetric Dimethyl Hydrazine	CASI
UDOFT	Universal Digital Operational Flight Trainer	CASI
UDOP	Ultrahigh Frequency Doppler (tracking system)	CASI
UDP	User Datagram Protocol	Goddard
UELV	Ultralite Expendable Launch Vehicle	Goddard
UESP	University Earth Science Pathfinder	Goddard
UFI	Uniform Files Index	Langley
UFLB	Unaberrated Focused Light Beam	Goddard
UFO	User Files On-line	Goddard
UFO	Unidentified Flying Object	CASI
UGC	Uppsala General Catalog (galaxies)	CASI
UHDR	Ultra High Data Rate	Goddard
UHF	Ultra High Frequency	CASI
UHTREX	Ultra High Temperature Reactor Experiment	CASI
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UI	University of Iowa	Goddard
UIA	Unassigned Integer Arithmetic	Goddard
UID	User Identifier	Goddard
UIID	Unique Instrument Interface Document	Goddard
UIR	Unidentified Infrared Feature	Goddard
UIR	User Incident Report	CASI
UIRC	Unidentified Infrared Feature Carriers	Goddard
UIT	Ultraviolet Imaging Telescope	Goddard
UIT	Ultraviolet Imaging Telescope (Shuttle payload)	CASI
UK	United Kingdom	Goddard
UKMO	United Kingdom Meteorological Office	Goddard
ULA	Underwater Location Aids	CASI
ULC	Unpressurized Logistics Carrier	CASI
ULE	Ultra Low Expansion	Goddard
ULIRG	Ultra Luminous Infrared Galaxy	Goddard
ULM	Ultrasonic Line Modulator	CASI
ULP	Ultra Low Chamber Pressure	CASI
ULX	Ultra-Luminous X-ray (Source)	CASI
ULYSSES	(Formerly ISPM International Solar Polar Mission)	CASI
UM	UARS Missions	Goddard
UMAC	Upper Midwest Aerospace Consortium	Goddard
UMCP	University of Maryland, College Park	Goddard
UMD	University of Maryland	Goddard
UMSOC	University of Maryland Science Operation Center	Goddard
UMTA	Urban Mass Transit Administration	CASI
UN	United Nations	Langley
UND	University of National Defense (Previously ICAF & National War	CASI
UNDP	United Nations Development Program	CASI
UNEP	United Nations Environment Program	CASI
UNESCO	United Nations Educational, Scientific and Cultural Organization	CASI
UnESS	University-class Earth System Science	Goddard
UNEX	UNiversity EXplorer	CASI
UNH	University of New Hampshire	Goddard
UNICODE	Unique Injector Concepts Development	CASI
UNISTAR	User Network for Information Storage, Transfer, Acquisition and	CASI
UNIX	An operating system software (Computer science)	Langley
UNM	University of New Mexico	Goddard
UOF	Unit of Functionality	Goddard
UOG	User and Operations Guide	Goddard
UPD	User Performance Data	Goddard
UPN	Unique Project Number	Goddard
UPS	Undergraduate Professional Study Program	Goddard
UPS	Uninterruptible Power Source	Goddard
UPS	Uninterruptible Power Supply	Goddard
UPS	User Planning System	Goddard
UQL	Upper Quasihomogeneous Layer	CASI
UQPSK	Unbalanced Quadriphase Shift Key/Keying	Goddard
URA	Uniformly Redundant Array	CASI
URI	Universal Resource Indicator	CASI
URL	Uniform Resource Locator	Goddard
URL	Universal Resource Locator	CASI
URN	Universal Resource Name	CASI
UROP	Undergraduate Research Opportunities Program	Goddard
URSI	International Union of Radar Science	Langley
URSI	Union Radio Scientific International	CASI
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US	Unitary Symmetry	CASI
US PRO	U. S. Product Data Association	Goddard
US TAG	U. S. Technical Advisory Group	Goddard
USA	United Space Alliance	Goddard
USA	United States Army	CASI
USA	United States of America	CASI
USAF	United States Air Force	CASI
USAFET	United States Air Forces in Europe (Turkey)	CASI
USAJFKSWCS	US Army John F. Kennedy Special Warfare Center and School	CASI
USB	Unified S-Band	Goddard
USB	User’s Support Branch	Goddard
USC	United States Code	CASI
USC	University of Southern California	CASI
USCG	United States Coast Guard	CASI
USDA	United States Department of Agriculture	CASI
USE	Undergraduate Study Education Program	Goddard
USE	User Support Environment	CASI
USEPPA	Universal System of Units of Industrial Pneumatic Automation	CASI
USF	UltraSonic Fatigue	CASI
USF	University of San Francisco	CASI
USF	University of South Florida	CASI
USFWS	U.S. Fish and Wildlife Service	Goddard
USGCRP	U.S. Global Change Research Program	Goddard
USGCRP	United States Global Change Research Program	CASI
USGS	U.S. Geological Survey	Goddard
USGS	United States Geological Survey	Langley
USGS	Geological Survey, Denver, CO	CASI
USGS	Geological Survey, Washington, DC	CASI
USIP	United States Innovation Partnership	Langley
USL	Navy Underwater Sound Lab., Fort Trumbull, New London, CT	CASI
USL	United States Laboratory	CASI
USML	United States Microgravity Laboratory	CASI
USML	United States Munitions List	CASI
USMP	United States Microgravity Payload	CASI
USN	United States Navy	CASI
USN	Universal Space Network	CASI
USNA	United States Naval Academy	Goddard
USNO	U.S. Naval Observatory	Goddard
USO	Ultra Stable Oscillator	Goddard
USOC	United States Operations Center	Goddard
USP/ESS	Unmanned Spacecraft Panels/Environmental Satellite Subpanel	CASI
USPO	Urban Systems Project Office	CASI
USRA	Universities Space Research Association	CASI
USRL	Navy Underwater Sound References Lab., Orlando, FL	CASI
USS	User Services Subsystem	Goddard
USS	Unique Support Structure	CASI
USSPACECOM	United States Space Command	Goddard
UST	Universal Standard Time	Goddard
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UT	University of Texas	Goddard
UT	Universal Time	CASI
UT	Upper Troposphere	CASI
UT/LS	Upper Troposphere/Lower Stratosphere	CASI
UT1	Universal Time System one	CASI
UTC	Universal Time Clock	Goddard
UTC	Universal Time Code	Goddard
UTC	Upper Tropospheric Clouds	Langley
UTC	Universal Time Coordinated	CASI
UTCF	Universal Time Correlation Factor	Goddard
UTCPAB	Unified Triservice CognitivePerformance Assessment Battery	CASI
UTDF	Universal Tracking Data Format	CASI
UTE	Unit Test Equipment	Goddard
UTM	Universal Transverse Mercator	CASI
UTMC	United Technologies Microelectronics Corporation	Goddard
UTMC	United Technologies Microprocessor Chip	Goddard
UTMC	Universal Time Master Clock	Goddard
UTMC	Utah Microelectronic Center	Goddard
UTS	Ultimate Tensile Strength	CASI
UTTAS	Utility Tactical Transport Aircraft System	CASI
UUT	Unit Under Test	Goddard
UV	Ultraviolet	CASI
UVa	University of Virginia	Goddard
UV-B	Ultraviolet-B	Goddard
UVCS	Ultraviolet Coronal Spectrometer	Goddard
UVPI	Ultraviolet Plume Imager	CASI
UVR	Ultraviolet Radiation	CASI
UVS	Ultraviolet Spectrometer	CASI
UVSP	Ultraviolet Spectrometer Polarimeter	CASI
UW	University of Washington	Goddard
UW	University of Wisconsin	Goddard
UWG	User Working Group	CASI
UWT	Unitary Wind Tunnel	Langley
UXO	UneXploded Ordnance	CASI
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