| Acronym | Meaning |
 | SEM | System Engineering Management |
| DAS | Digital Address System |
| SSIBD | Shuttle System Interface Block Diagram |
| EPA | Environmental Protection Agency |
| ACR | Active Cavity Radiometer |
| DDC | Defense Documentation Center |
| FF | Flight Forward |
| OP | Operation |
| RETEN | Retention |
| OMI | Operations And Maintenance Instruction |
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