Research & information: general 12 International relations 8 Warfare & defence 8 Defence strategy, planning & research 6 Military history 6 Terrorism, armed struggle 6 Espionage & secret services 5 History of engineering & technology 5 Geography 4 Information technology industries 3 Law 3 Technology: general issues 3 European history 2 Political control & freedoms 2 Aerospace & aviation technology 1 Ambulance & rescue services 1 Aviation law 1 Environmental economics 1 Environmental science, engineering & technology 1 Impact of science & technology on society 1 International law 1 Jurisprudence & general issues 1 Media studies 1 Middle Eastern history 1 Military history: post WW2 conflicts 1 Politics & government 1 Robotics 1 Social & political philosophy 1 War crimes 1