| Acronym | Meaning |
 | BUOU | Backup Optical Unit |
| LAIU | Launch Abort Interface Unit |
| SSUS-A | SSUS For Atlas-Centaur Class Spacecraft |
| R | LEO Request Liaison Engineering Order |
| SDCS | SAIL Data Communications SYstem |
| PIU | Pyrotechnic Initiator Unit |
| OMRB | Operating Material Review Board |
| PRB | Project Review Board |
| RAM | Responsibility Assignment Matrix |
| RS | Right Side |
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