| Acronym | Meaning |
| GECALL | GCOS Program Element Name |
| EU | Experimental Unit |
| MLP | Mobile Launch (Launcher) Platform |
| EMON | ExceptionMonitoring |
| CS | Change Status |
| M | LGS Microwave Landing Guidance System |
| SPTD | Supplemental Provisioning Technical Documentation |
| MDL | Master Data Library |
| GE | General Electric |
| EPOC | External Payload Operations Center |