| Acronym | Meaning |
 | GTN | Germantown |
| GAPEX | Ground-based Atmospheric Profiling Experiment |
| OT | Optical Techniques Group |
| IRIS | Infrared Interferometer Spectrometer |
| U.S./JC | United States/Japan Cooperation |
| GPS | Geophysical Processor System |
| NAE | National Academy Of Engineering |
| EMF | Electromagnetic Field/force |
| WMC | World Meteorological Center(s) |
| APD | Avalanche Photodiode |
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