OALC: Ogden Air Logistics Center
OCALC: Oklahoma City Air Logistics Center
OMA: Operation and Maintenance, Army
OMA: Operations Maintenance Area
OMA: Orbiter Maintenance Area
OMA: Organizational Maintenance Activities
OMAR: Operation and Maintenance, Army Reserve
OMARNG: operation and maintenance, Army National Guard
OMCF: Operations and Maintenance Control File
OMCF: Orbiter Maintenance and Checkout Facility
OMCS: Operations and Maintenance Communications System
OMD: Operations and Maintenance Documentation
OMDP: Orbiter Maintenance Down Period
OMDR: Operations and Maintenance Data Record
OMEWG: Orbiter Maintenance Engineering Working Group
OMI: Operations and Maintenance Instruction
OMIJC: operations and maintenance instruction job card
OMISS: Operation and Maintenance Instruction Summary Sheet
OMMH: Orbiter Maintenance Man-Hour
OMMS: Organization Maintenance Management System
OMP: Operating Maintenance Plan
OMP: Operations and Maintenance Plan
OMPR: Operational Maintainability Problem Reporting
OMR: Operations and Maintenance Requirement
OMRC: Operational Maintenance Requirements Catalog
OMRF: Orbiter Maintenance and Refurbishment Facility
OMRF: Orbiter Modification and Refurbishment Facility
OMRP: Operations and Maintenance Requirements Plan
OMRS: Operations and Maintenance Requirements and Specifications
OMRS: Operations and Maintenance Requirements System
OMRSD: Operations and Maintenance Requirements and Specifications Document
OMS: Order Management System
OOMM: Organizational Operations and Maintenance Manual
ORLA: Optimum Repair Level Analysis
OSCRS: Orbital Spacecraft Consumables Resupply System
OSMP: Operational Support Maintenance Plan