| Acronym | Meaning |
 | NEP | NNEP Normal Entry Point |
| PCO | Postcheckout |
| TCS | Technical Concurrence Sheets |
| MS | Multistring |
| IDU | Interface Demonstration Unit |
| HBT | Heflex Bio-Engineering Test |
| TDRS | Tracking And Data Relay Satellite |
| NR | Noise Rating |
| NVB | Navigational Base |
| WUSCI | Western Union Space Communications |
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