| Acronym | Meaning |
| MPSR | Multipurpose Support Room |
| STDN | Space Flight Tracking And Data Network |
| L | Length |
| SCS | Secondary Coolant System |
| FPOV | Fuel Preburner Oxidizer Valve |
| NWSI | New World Services Inc. |
| OPA | Operations Planning Analysis |
| PSS | Propellant Supply Subsystem |
| ILC | Initial Launch Capability |
| EST | Estimate(d) |