An incident or situation involving a threat to a nation, its territories, citizens, military forces, possessions, or vital interests that develops rapidly and creates a condition of such diplomatic, economic, political, or military importance that commitment of military forces and resources is contemplated to achieve national objectives. (JP 3-0)
CRISIS
Meaning of CRISIS in English
DOD English dictionary of military terms. Английский словарь военных терминов DOD. 2012