Broken-arrow meaning

(US, military) A code phrase that a ground unit is facing imminent destruction from enemy attack and all available air forces within range are to provide air support immediately.
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(US, euphemistic, military) An accidental event that involves nuclear weapons or nuclear components but does not create the risk of nuclear war.
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(US, euphemistic) Alternative spelling of broken arrow, a nuclear accident.
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The definition of Broken Arrow is an accident involving nuclear weapons or supplies that does not cause a nuclear war risk, or a city in northeastern Oklahoma.

An example of a Broken Arrow is a nuclear device going off by accident.

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