Obstructive Sleep Apnea 
Open Systems Architecture 
Operational Support Airlift 
Optical Society of America 
Office of the Secretary of the Army 
Open Scripting Architecture 
Open System Architecture 
Open Service Architecture 
Open Services Architecture 
Open Systems Adapter 
Operational Support Aircraft 
obstructive sleep apnoea 
Office of Student Affairs 
Office of Systems Analysis 
Open Service Access 
Operating System Administrator 
Operational safety assessment 
Operational Support Area 
Optical Spectrum Analyzer 
Augustinian Sisters 
IATA code for All Airports, Osaka, Jap… 
IATA code for Mount Pleasant Regional… 
Oakland School For the Arts 
Object System Adaptor 
Objective Switching Architecture 
obstructive sleep apnea syndrome 
obstructive sleep apneas 
obstructive sleep apnoea syndrome 
occlusive sleep apnea syndrome 
Offensive Situation Awareness