Civil defence is the organization and training of the ordinary people in a country so that they can help the armed forces, medical services, or police force, for example if the country is attacked by an enemy.
...a civil defence exercise.
civil defence in British English
noun
the organizing of civilians to deal with enemy attacks
Examples of 'civil defence' in a sentence
civil defence
Other early films included shorts about the fire service and civil defence.
Times, Sunday Times (2014)
Civil defence, police and the military worked throughout the morning to search for survivors and recover bodies amid the crumpled and charred cars.