Moral and ethical aspects War Just war doctrine 32 Military ethics 32 History 16 Religious aspects 13 War (Philosophy) 12 Terrorism 11 War (International law) 10 Peace 8 Soldiers 8 Civilian war casualties 7 Military policy 7 Combatants and noncombatants (International law) 6 Drone aircraft 6 Iraq War, 2003-2011 6 Military history, Modern 6 Military art and science 5 Psychological aspects 5 War and society 5 War victims 5 Christianity 4 Ethics 4 Mental health 4 Security, International 4 Veterans 4 Afghan War, 2001- 3 Civilians in war 3 Ethnic conflict 3 Foreign relations 3