History World War, 1939-1945 9 Aircraft carriers 3 Campaigns 3 Naval operations 3 Aerial operations 2 Allied occupation 2 Naval aviation 2 Pearl Harbor (Hawaii), Attack on, 1941 2 Aerial operations, Japanese 1 Airplane racing 1 Bismarck Sea, Battle of the,1943 1 Foreign relations 1 Kaigun 1 Midget submarines 1 Military policy 1 Naval convoys 1 Naval operations, Japanese 1 Psychological aspects 1 Strategy 1 Submarine 1 Suicide 1 World War 1 World war, 1939-1945 1 campaign 1