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on-call mission ['ɔnkɔ:l'mɪʃ(ə)n] stresses
gen.	вылет по боевой тревоге; вылет по вызову
mil.	неплановый огонь по вызову; неплановый вылет по вызову
mil., artil.	ведение огня по вызову
English thesaurus
on-call mission ['ɔnkɔ:l'mɪʃ(ə)n]
mil., logist.	A type of air support mission which is not requested sufficiently in advance of the desired time of execution to permit detailed planning and briefing of pilots prior to takeoff. Aircraft scheduled for this type of mission are on air, ground or carrier alert and are armed with a prescribed load. (UKR/NATO)