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Operational definition, Operational auditing, Operational semantics, Operational level of war, Operational system, The Operational Art of War, Operational risk, Operational View, Standardized approach (operational risk), Operational conversion unit, Operational Requirement, Operational Group (Poland), Journal of the Operational Research Society, Operational acceptance testing, Operational Service Medal, Operational risk management, Operational amplifier, Operational excellence, The Operational Art of War Vol. 1: 1939–1955, Operational Research Society, Operational Test and Evaluation Force, Director, Operational Test and Evaluation, Operational historian, Operational database, Operational manoeuvre group, Operational Land Forces Command, Operational Service Medal for Afghanistan, Operational artificial intelligence, Common operational picture, No. 237 Operational Conversion Unit RAF, Australian Operational Service Medal, Operational data store, Operational due diligence, No. 226 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loads monitoring, No. 228 Operational Conversion Unit RAF, Operational stress injury, Operational Silo Test Facility, No. 236 Operational Conversion Unit RAF, Naval Center for Combat and Operational Stress Control, Operational design domain, Strike Attack Operational Evaluation Unit, 17th Operational Weather Squadron, Bayesian operational modal analysis, New Zealand Operational Service Medal, Operational Service Medal for the Democratic Republic of Congo, No. 2 Operational Conversion Unit RAAF, Ground based operational surveillance system, Operational efficiency, Operational responsiveness, NATO Maritime Interdiction Operational Training Centre, Aerospace Operational Support Group RAAF, Current-feedback operational amplifier, Operational transformation, Joint Operational Support Airlift Center, No. 5 Operational Training Unit RAAF, No. 231 Operational Conversion Unit RAF, Marine Operational Training Group 81, Operational Group Ermakov, Air Force Operational Test and Evaluation Center, 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