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- Operation Eagle Claw, Iran, 19802
- Operation Joint Endeavor, 1995-19964
- Operational readiness2
- Operations other than war4
- Opioid abuse2
- Opposition (Political science)2
- Oral history1
- Oratory14
- Organizations26
- Organized crime12
- Organized crime investigation12
- Organizing12
- Osage Indians2
- Outpatient services2
- Overtime2