Moral and ethical aspects Political aspects 3 Social aspects 3 Air warfare 2 Drone aircraft 2 Foreign relations 2 History 2 Mass media and public opinion 2 Nationalism 2 Violence 2 Algorithms 1 Big data 1 Democracy 1 Mathematical models 1 Social conditions 1 Social indicators 1 War on Terrorism, 2001- 1 War on Terrorism, 2001-2009 1