| Acronym | Meaning |
 | HFDS | Hydrogen Fluid Distribution System |
| PMI | Preventive Maintenance Instruction |
| MERL | Materials Engineering Research Laboratory |
| LC | Integrated Circuit |
| DPP | Data Processing And Software |
| SEM | Seller's Engineering Memo |
| CDMS | Command And Data Management Subsystem |
| NESR | NNESRNatural Environment Support Room |
| OPA | Operations Planning Analysis |
| HIGH | PressuHigh Pressure |
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