| Acronym | Meaning |
 | ISPG | Institutional Support Planning GrouP |
| COM | Common |
| MLB | Multilayer Board |
| PDP | Preliminary Definition Plan |
| GNCIS | GNGNCISGN&C Integration Simulator |
| ICF | Interface Control Function |
| SHRD | Supplemental Heat Rejection Devices |
| DCSI | Data And Cqntrol Signal Interface |
| CSIU | Core Segment Interface Unit |
| IDO | InterdivisionalOperations |
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