| Acronym | Meaning |
 | GSTDN | Ground Space Flight Tracking And Data Network |
| ESVS | Escape System Ventilation System |
| DME | Distance Measur Ng EquiPment |
| P&M | Phase Modulation (Modulated) |
| M | Matrix |
| ISS | Installation Support Services |
| PRD | Program Requirements Documents (UDS) |
| EHS | Environmental Health Services |
| MMLS | Model-Modes-Loads-Stresses |
| EMCC | Emergency Mission Control Center |
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