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combined operations

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plural noun
war operations carried out cooperatively by two or more allied nations or by coordination of the land, sea, and air forces of one or more nations.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Origin of combined operations

First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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