An underground shelter or tunnel built for protection against enemy air raids.

missiles designed to be used against enemy aircraft; surface-to-air missiles

dugout or trench built to provide protection from enemy air raids; can be used for shelter or as a tactical position

A commemorative day on November 21st, established in 1940 to mark the first air defense exercise held in Nanjing in 1934

Taiwan usage for evacuation to an air-raid shelter.

medium-to-high-altitude air defense; specifically referring to HIMAD systems

Taiwanese term for an air-raid shelter or civilian protection bunker

measures taken to mobilize and organize the population against air attacks

civil air defense works or infrastructure designed to protect citizens during aerial attacks

anti-air-raid maneuvers; practice exercises for defending against an air attack