| Acronym | Meaning |
 | SOV | Shut-off Valve |
| CONSTR | Construct |
| R | Rear |
| DDU | Decommutator Distribution Unit |
| ESA | Explosive Safe Area (KSC) |
| DUM | Dummy |
| EPTU | Events Per Time Unit |
| STD | LStandard Distribution List (letter Denoting Which List |
| NMAB | National Materials Advisory Board |
| PAH | PaYload Accommodations Handbook |
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