Body: "Civil defense" is the study of Civil defense (civil defence in some varieties of English) or civil protection is an effort to protect the citizens of a state (generally non-combatants) from military attacks and natural disasters.
Professionals of "Civil defense" include John George Diefenbaker.
Some questions in "Civil defense" involve war and aerial bombardment grew.
Why study "Civil defense"? It uses the principles of emergency operations: prevention, mitigation, preparation, response, or emergency evacuation and recovery.