World War, 1939-1945 History 31 Equipment and supplies 15 Tank warfare 13 Tanks (Military science) 10 Aerial operations 9 Airplanes, Military 9 Naval operations 7 Design and construction 6 Pictorial works 6 Aerial operations, British 5 Artillery 4 Equipment 4 Military weapons 4 Warships 4 World War, 1914-1918 4 Fighter planes 3 Pistols 3 Aerial operations, American 2 Aerial operations, Germany 2 Armament 2 Armed Forces 2 Campaigns 2 Firearms 2 Grenades 2 Rifles 2 Tanks 2 Tiger (Tank) 2 Weapons systems 2 World War 1939-1945 2