| Acronym | Meaning |
| IOC | Initial Operational Capability |
| TMB | Transportation Management Bulletin |
| PAR | Product Acceptance Review |
| G | IWG Ground Interface Working Group |
| FLEX | Flexible |
| SIR-A | Shuttle Imaging Radar@A |
| TFE | Time From Event |
| SMPM | Structural Materials Property Manual |
| VCM | Volatile Condensable Material |
| DVT | Design Verification Testing |