#air_defense__airdefense  defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectiveness
  supertype:  defensive_measure__defensivemeasure__defense  military action or resources protecting a country against potential enemies; "they died in the defense of Stalingrad"; "they were developed for the defense program"
  subtype:  active_air_defense  air defense by the use aircraft or missiles or artillery or electronic countermeasures
  subtype:  passive_air_defense__passiveairdefense  air defense by the use of deception or dispersion or protective construction

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