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An operation conducted by forces of two or more Allied nations acting together for the accomplishment of a single mission.
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|Noun||1.||combined operation - a military operation carried out cooperatively by two or more allied nations or a military operation carried out by coordination of sea, land, and air forces|
military operation, operation - activity by a military or naval force (as a maneuver or campaign); "it was a joint operation of the navy and air force"