#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"
  supertype:  military_action__action  a military engagement; "he saw action in Korea"
  subtype:  umbrella.defensive_measure  a formation of military planes maintained over ground operations or targets; "an air umbrella over England"
  subtype:  air_defense__airdefense  defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectiveness
     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
  subtype:  stand.defensive_measure  a defensive effort; "the army made a final stand at the Rhone"
     subtype:  repulsion__standoff  the act of repulsing or repelling an attack; a successful defensive stand
  subtype:  hasty_defense__hastydefense__hasty_defence__hastydefence  a defense organized while in contact with the enemy or when time is limited
  subtype:  deliberate_defense__deliberate_defence  a defensive organized before contact is made with the enemy and while time for organization is available; usually includes a fortified zone (with pillboxes) and communication systems
     subtype:  fortification__strengthening  the act of fortifying or strengthening defenses
  subtype:  chemical_defense__chemical_defence  procedures involved in taking defensive measures against attacks using chemical agents
  subtype:  minelaying__mining  laying explosive mines in concealed places to destroy enemy personnel and equipment
  subtype:  biological_warfare_defense__BW_defense  defense against biological warfare

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