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Glossary
O&M :
Operation & Maintenance
O/S :
Operating System
OCR :
Operational & Certification Requirement
OD :
Orbit Designation
OHA :
Operating Hazard Analysis
ORD :
Operations Requirements Document
ORR :
Operational Readiness Review
OS :
Open Service
OS :
Open Service
OS-NMA :
Open Service Navigation Message Authentication service
OSI :
Open Systems Interconnection