| Acronym | Meaning |
| LOWG | Landing Operations Working Group |
| PRD | ProcurementRequirementsDocument |
| TB | Talk Back |
| TAP | Technical Achievement Plan |
| ISP | Initial Specific Impulse |
| EMEC | Electromagnetic Effects Capability |
| IPS | Inner Roll Gimbal |
| S-BD | S-Band |
| PO | PurchaseOrder |
| TTC | Time To Circularize (Orbit) |