| Acronym | Meaning |
 | NSS | Nodal Switching Subsystem |
| DASC | Defense Logistics Agency Administrative Support Center |
| ZTD | Zenith Tropospheric Signal Delay |
| PPI | Plan-postition Indicator |
| LAPS | Local Analysis And Prediction System |
| TES | Tropospheric Emission Spectrometer |
| PEM | Particle Environment Monitor |
| DAI | Data Assimilation Initiative |
| FOIA | Freedom Of Information Act |
| EMF | Electromotive Force |
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