| Acronym | Meaning |
| PRR | Pulse Repetition Rate |
| MUMS | Multiple Use Marc System |
| SHDN | Shutdown |
| GSSI | Ground Support System Integration |
| CHL | Certified Hardware List |
| N/B | Narrow Band |
| SAM | SYstem Activation And Monitoring |
| PAD | Preliminary Advisory Data (Crew Data Uplink) |
| G | IWG Ground Interface Working Group |
| O&C | Operation(s) And Checkout (Building-was MSOB) |