Office of the Secretary of Defense 
Office of Systems Development 
Office of Secretary of Defense 
onscreen display 
Operating System Deployment 
Operational Sequence Diagram 
Office Secretary of Defense 
Operational Systems Development 
Office of the Secretary Defense 
Office of the Secretary of Defense's 
Open shelter deck 
Open Software Description 
Operating System Dependent 
Operational Service Date 
Operations Support Directive 
optical scanning device 
Optical Surrogate Detector 
OSISession Driver 
Oakesdale School District 
Oakland School District 
Oakridge School District 
Oakville School District 
Object Storage Device 
Object-based Storage Device 
occult spinal dysraphism 
occupational skin disease 
Occupational skin diseases 
Oceanside School District 
Ocosta School District 
Odessa School District