Warfare & defence 92 Civil defence 29 Society & social sciences 29 International relations 26 Politics & government 23 Military history 17 Political control & freedoms 17 Espionage & secret services 8 Defence strategy, planning & research 7 Peace studies & conflict resolution 7 Terrorism, armed struggle 6 Diplomacy 4 European history 4 Human rights 4 International institutions 4 Political science & theory 4 Arms negotiation & control 3 Social & cultural history 3 Central government policies 2 Development studies 2 Ethical issues & debates 2 History of other lands 2 International humanitarian law 2 Military administration 2 Afghan War 1 Anthropology 1 Applied ecology 1 Armed conflict 1 Asian history 1 Australasian & Pacific history 1