47 USS definitions

United States Ship 
Undersea Surveillance System 
Unique Support Structure 
United States Standard 
UNIX System Services 
Upper Stage Simulator 
User Support System 
Unformatted Systems Service 
Unilateral Synchronization System 
United States Senate 
universal spine system 
Universities Superannuation Scheme 
Unstructured Supplementary Services 
User Services Subsystem 
User Services Support 
Utility Support Structure 
U.S. Shipping Partners L.P. 
Ulead Smart Saver 
Ultimate Shear Strength 
ultrasonic scanning 
ultrasound scan 
ultrasound scanning 
ultrasound scans 
ultrasound study 
Under Seat Steering 
Under Speed Sensor 
Undercarriage Selector Switch 
Unformatted System Service 
Uniform Symbol Specification 
Uniform Symbology Specifications