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OC
Abbreviation:Officer Commanding
ONUCA
Acronym:United Nations Observer Group in Central America
ONUSAL
Acronym:United Nations Observer Mission in El Salvador

United Nations Observer Mission in El Salvador

OP
Acronym:Observation Post
OSCE
Acronym:Operation for Security and Co-Operation in Europe

Operation for Security and Co-Operation in Europe

OSGA
Acronym:Office of the Secretary General in Afghanistan

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