Siena Donor: Vallely, M.L.S., John R. World War, 1939-1945 History 108 Campaigns 81 Aerial operations, American 37 Aerial operations, German 30 Tank warfare 21 more ... Fighter pilots 16 Naval operations 16 Tanks (Military science) 16 Aerial operations 15 Armed Forces 11 Equipment and supplies 11 Regimental histories 10 Aerial operations, British 9 Aerial operations, Japanese 9 Airplanes, Military 9 Submarine 9 Fighter planes 8 Naval operations, American 8 Armored vehicles, Military 5 History, Military 5 Military uniforms 4 Naval operations, British 4 Submarines (Ships) 4 Warships 4 World War, 1914-1918 4 Aeronautics, Military 3 Air warfare 3 Bombers 3 less ...