| Acronym | Meaning |
![](file.png) | OP | Operation |
![](file.png) | OP | Oxygen Purge |
![](file.png) | OPA | Operations Planning Analysis |
![](file.png) | OPB | Oxidizer Preburner |
![](file.png) | OPBOV | Oxidizer Preburner Oxidizer Valve |
![](file.png) | OPDAR | OPtical Detection And Ranging |
![](file.png) | OPE | Other Project Element |
![](file.png) | OPER | Operations |
![](file.png) | OPER | Operation |
![](file.png) | OPF | Orbiter Processing Facility |
![](file.png) | OPF | Orbiter Processing Facility |
![](file.png) | OPFC | Orbiter Preflight Checklist |
![](file.png) | OPGUID | OPtimum Guidance (Technique) |
![](file.png) | OPI | Orbiter Payload Interrogator |
![](file.png) | OPIDF | Operational Planning Identification File |
![](file.png) | OPIS | Orbiter Prime Item Specification |
![](file.png) | OPL | Open Problem List |
![](file.png) | OPL | Operational |
![](file.png) | OPLF | Orbiter Processing And Landing Facility |
![](file.png) | OPNS | Operational Phase |
![](file.png) | OPO | Orbiter Project(s) Office |
![](file.png) | OPOV | Oxidizer Preburner Oxidizer Valve |
![](file.png) | OPOV | Oxidizer Preburner Oxidizer Valve |
![](file.png) | OPP | Opportunity |
![](file.png) | OPP | OPPosite |
![](file.png) | OPPAR | Orbiter Project(s) Parts Authorization Request |
![](file.png) | OPPL | Orbiter Project Parts List |
![](file.png) | OPR | Office Of Primary Responsibility |
![](file.png) | OPR | Operations Planning Review |
![](file.png) | OPR | Operator |
![](file.png) | OPR | Orbiter/Payload Recorder |
![](file.png) | OPR | Oxygen Pressure Regulator |
![](file.png) | OPRV | Oxygen Pressure Relief Valve |
![](file.png) | OPS | Operational Sequence |
![](file.png) | OPS | Operations |
![](file.png) | OPS | Operations Sequence |
![](file.png) | OPS | Orbiter Project Schedules |
![](file.png) | OPS | Oxygen Purge System |
![](file.png) | OPSB | Orbiter Processing SuPport Building |
![](file.png) | OPSR | Operations Supervisor (GSTDN Site) |
![](file.png) | OPSS | Orbital Propellant Storage Subsystem |
![](file.png) | OPT | OPerational Pressure Transducer |
![](file.png) | OPT | Optics |
![](file.png) | OPT | Optimum |
![](file.png) | OPT | Option |
![](file.png) | OPTB | Operational Program Time Base |
![](file.png) | OPTB | Opposite |
![](file.png) | OR | OPerational Right |
![](file.png) | OR | Operations Requirement |
![](file.png) | OR | Operations Review |