| Acronym | Meaning |
 | GAT | General Aviation Transponder |
| JSC | Joint Scientific Committee |
| GCM | Global Change Model |
| GISS | Goddard Institute For Space Studies |
| RUI | Research In Undergraduate Institutions |
| IFR | Instrument Flight Rules |
| ANL-E | Argonne National Laboratory-East |
| FHSA | Federal Hazardous Substances Act |
| SPC | Sector Processing Center |
| URSI | International Union Of Radio Science |
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