World War, 1939-1945 40 History 35 Campaigns 17 Airplanes, Military 7 Politics and government 6 Armed Forces 5 Equipment and supplies 5 Secret service 5 World war, 1939-1945 5 Aerial operations, Germany 4 Equipment 4 Foreign relations 4 Germany 4 National socialism 4 World War 1939-1945 4 Aerial operations 3 Army 3 Biography 3 Vehicles, Military 3 World war 3 Aerial operation 2 Aerial operations, British 2 Bombers 2 Dictionaries 2 Diplomatic history 2 Fighter pilots 2 Generals 2 Hitler, Adolf, 1889-1945 2 Kriegsmarine 2 Military 2