History Military art and science 10 Military policy 8 United States 7 Armed Forces 6 Foreign relations 5 National security 5 Technological innovations 5 Military research 4 Special operations (Military science) 4 Biography 3 Campaigns 3 Government policy 3 Iraq War, 2003-2011 3 Terrorism 3 World politics 3 Arab Spring, 2010- 2 Democratization 2 Imperialism 2 Intelligence service 2 Iraq War, 2003 2 Military doctrine 2 Personal narratives, American 2 Prevention 2 Protest movements 2 Reorganization 2 Soldiers 2 Strategy 2 Targeted killing 2 Aerial operations, American 1