Columbia subject headings:
Armies--Organization.
Civil defense--Europe.
Civil defense--United States.
Civil-military relations.
Europe--Armed Forces.
National security.
United States--Armed Forces.
Harvard subject headings:
Armies--Organization
Civil defense--Europe.
Civil defense--United States
Civil-military relations
Europe--Armed Forces.
National security.
United States--Armed Forces.
Princeton subject headings:
Armies--Organization.
Civil defense--Europe.
Civil defense--United States.
Civil-military relations.
Europe--Armed Forces.
National security.
United States. Armed Forces