| Acronym | Meaning |
 | AFSPC | Air Force Space Command |
| ICAO | International Civil Aviation Organization |
| OPM | Office Of Personnel Management |
| SSS | Selective Service System |
| NCBI | National Center For Biotechnology Information |
| ECIE | Executive Council On Integrity And Effiency |
| OSHA | Occupational Safety And Health Administration |
| UPU | Universal Postal Union |
| USPS | United States Postal Service ˜(state And Street Abbreviations) |
| NCEH | National Center For Environmental Health |
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