Organization for the Advancement of St… 
Online Application System Interactive… 
Open And Secure Information Systems 
Oceanic and Atmospheric Scientific Inf… 
Organic Airborne and Surface Influence… 
Online Analytical Statistical Informat… 
Open And Secure Informations Systems 
Operational Activities Special Informa… 
operational area satellite information… 
Organization for the Advancement for S… 
Ocean All Source Information System 
Oceanic & Atmospheric Scientific Infor… 
OEX Autonomous Supporting Instrumentat… 
Office Automation and Systems Improvem… 
Office automation strategy for informa… 
Operational Application of Special Int… 
Operational Automatic Scheduling Infor… 
Operations and Science Instrument Supp… 
Optical Acoustic Satcom Integrated Sen… 
Optimized Advanced System Integration… 
Orbit Avionics Software Integration St… 
Orbiter Avionics to Station Interface… 
Organization for the Advancement of St… 
Oasis Hong Kong Airlines 
Objective Assessment of Skills in Intr… 
Observation at Several Interacting Sca… 
Observational Arthritis Study in Senio… 
Observations At Several Interacting Sc… 
Obstetric Anesthesia Safety Improvemen… 
Ocean Acquisition System For Interdisc…