Government policy 18 Intelligence service 16 History 8 Foreign relations 7 Military policy 7 Terrorism 7 Economic policy 5 Medical policy 5 National security 5 Prevention 4 Civil service 3 Congresses 3 Dissertations, Academic 3 Politics and government 3 September 11 Terrorist Attacks, 2001 3 Social interaction 3 Social policy 3 Subject headings 3 Thesis 3 United States 3 juvenile literature 3 social policy 3 Armed Forces 2 Bioterrorism 2 Cold War 2 Counterinsurgency 2 Defenses 2 Emergency management 2 Espionage 2 Geography 2