民間防衛
Civil defense truly began to come of age, both worldwide and in the United States, during the first World War—although it was usually referred to as "civilian defense." This was the first major total war, which required the involvement and support of the general population. Strategic bombing during World War I brought bombing raids by dirigibles and airplanes, with thousands of injuries and deaths. Attacks on non-combat ships, like the "Lusitania", presented another threat to non combatants. The British responded with an organized effort which was soon copied in the US. This was formalized with the creation of the Council of National Defense on August 29, 1916. Civil defense responsibilities at the federal level were vested in this council, with subsidiary councils at the state and local levels providing additional support—a multi-level structure which was to remain throughout the history of United States civil defense.