What does OPERA stand for?

Officer Professional Effectiveness Review for the Army (Australian Army)

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Organización de Países Exportadores de Petróleo Organizacion para la Educacion y Proteccion Ambiental (Spanish: Organization for Education and Environmental Protection; Colombia) Orissa Primary Education Programme Authority (Orissa, India) Office of Planning, Evaluation, and Policy Development (US Department of Education) Office of Program Evaluation and Research (Ohio Department of Mental Health) Operational Operator/Operations Observatoire Permanent de la Radioactivité dans l'Environnement (French: Permanent Observatory of Radioactivity in the Environment) Offers and Prospectuses Electronic Repository and Access (Singapore) Office of Program Evaluation & Risk Analysis		On-Line Periodicals and Research Area (IEEE) Open PLC European Research Alliance Operational Programme for the Exchange of Weather Radar Information (EUMETNET) Optical Packet Experimental Routing Architecture (lightwave technology) Organised Programme of Experimentation and Research into ATM Oscillation Project with Emulsion-Tracking Apparatus (Geneva, Switzerland) Out-Performance Equity Redeemable in Any Asset (convertible bond) Outpatient Endometrial Resection and Ablation (medical procedure) Ontario Parole and Earned Release Board (Canada) Off-Highway Plant and Equipment Research Centre (Loughborough University, UK)