What is another word for passive air defense?
Pronunciation: [pˈasɪv ˈe͡ə dɪfˈɛns] (IPA) 
Passive air defense is a strategy that relies on measures that don't require active engagement to fight against airborne threats. To refer to this strategy, you can also use several synonyms as an alternative to passive air defense. One of them is passive air protection, another one is passive air security, and the last one is passive air safety measures. All these synonyms represent the use of passive measures, such as protective structures, early warning systems, and specific materials, to counteract threats that may come from the air. In summary, the different synonyms for passive air defense describe the same range of strategies that focus on protecting against airborne threats without the need for engaging actively in combat.
