| ECOM | United States Army Electronics Command |
| USAF | United States Air Force |
| USA | United States of America Vereinigte Staaten von Amerika |
| USM | United States Mail |
| USA | United States Army US-Armee, http://www.army.mil |
| USP | United States Pharmacopeia |
| USS | United States Ship |
| US | United States [of America] |
| POTUS | President Of The United States |
| FGOTUS | First Gentleman of the United States |
| ACO | Allied Command Operations [engl.] NATO-Einheit, früher ACE |
| USCG | United States Coast Guard |
| USD | United States [of America] Dollar [s] |
| USAC | United States Answer Center |
| USDA | United States Department of Agriculture |
| USFL | United States Football League |
| USAC | United States Auto Club |
| USGS | United States Geological Survey |
| USCA | United States Code, Annotated |
| USMP | United States Microgravity Payload |
| USMC | United States Marine Corps |
| USGA | United States Golf Association |
| USNO | United States Naval Observatory Washington, DC, http://www.usno.navy.mil/ |
| USIA | United States Information Agency |
| AFUS | Air Force of the United States [engl.] Amerikanische Luftwaffe |
| AUS | Army of the United States [engl.] |
| U.S. Dep. Agric. Bull. | United States Department of Agriculture Bulletin Zeitschrift |
| Contrib. U. S. Natl. Herb. | Contributions from the United States National Herbarium Zeitschrift |
| USEPA | United States Environmental Protection Agency |
| U.S. Dep. Agric. Misc. Publ. | United States Department of Agriculture Miscellaneous Publication Zeitschrift |
| USN | Kriegsmarine der Vereinigten Staaten von Amerika [United States Navy] http://www.navy.mil |
| Proc. Natl. Acad. Sci. U.S.A. | Proceedings of the National Academy of Science of the United States of America Zeitschrift |
| UNCLE | United Network Command for Law Enforcement |
| GAS | Get-Away Special |
| VSOP | Very Special Old Programmer [like me] |
| SIG | Special Interest Group |
| SIT | Special Information Tone |
| EV 1716 | Nowa Special Food Ibbenbüren, Nordrhein-Westfalen |
| SAT | Special Access Termination |
| SAC | Special Area Code |
| NW-EZ 522 | Nowa Special Food Ibbenbüren, Nordrhein-Westfalen |
| SOL | Special Object Library |
| SVP | Special Visibility Program |
| MSDL | Motion Special Description Language |
| SPES | Special Program for Employment of Students |
| SIWG | Special Interest Working Group |
| SPNR | Special People Numbers Registry |
| ISSN | Integrated Special Services Network |
| SLSF | System Lords Special Force Schweizer Gameclan |
| BSIG | Bluetooth Special Interest Group [engl.] |