Category Nuances for civil_defense:

• civilian,
• governmental,
• internal,
• underground,
• military,
• defensive,
• practical,
• armed,
• timely,
• vital,
• iraqi,
• key,

Simple Categories for civil_defense:

• topic,
• organization,
• body,
• building,
• facility,
• system,
• sector,
• force,
• unit,
• challenge,
• activity,