broken arrow

noun

a) An accidental event that involves nuclear weapons or nuclear components but does not create the risk of nuclear war.

In the US, the code name for a serious nuclear weapons incident is "Broken Arrow". It is US policy neither to confirm nor deny the existence of nuclear weapons at any specific location; this also applies to Broken Arrow incidents.

b) (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.

See Also: Bent Spear, Empty Quiver, Faded Giant