| Acronym | Meaning |
 | SSA | 1/0 GCOS Program Element Name |
| DIGI | Digital |
| TCA | Translation Controller Assembly |
| LHC | Left Hand Circular |
| DMIS | Data Management Information System |
| EIVT | Electrical Interface Verification Test |
| BAC | Booster Assembly Contractor |
| GCIL | Ground Command Interface Logic |
| CPCEI | Computer Program Contract End Item |
| TNL | Tunnel |
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