| Acronym | Meaning |
 | MC | Mission Completion/Continuation |
| HIV | Helium Isolation Valve |
| SSPD | Shuttle System Payload Definition (Study) |
| MTEE | Electrical Maintenance Test Equipment |
| RU | Remote Unit |
| LOE | Left Outboard Elevon |
| CASO | Cancellation Addendum Sales Order |
| PVT | Pyrotechnic Verification Test |
| ORD | Ordnance |
| MS | Material Specification |
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