Campaigns 22 Military campaigns History 14 World War, 1939-1945 14 World War, 1914-1918 7 Armed Forces 6 Aerial operations, American 4 more ... American 4 Military operations, Aerial 4 Generals 3 Officers 3 Aerial operations, British 2 Airmen 2 Argonne, Battle of the, France, 1918 2 British 2 Command of troops 2 History, Military 2 Regimental histories 2 Aerial reconnaissance 1 African American 1 African American soldiers 1 African American troops 1 Bombenflugzeug 1 Bomber pilots 1 Bombing, Aerial 1 Causes 1 Cavalry operations 1 College presidents 1 Employees 1 Engineering and construction 1 less ...