Japanese aircraft carrier Kaga was created on 1929-11-30.
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The Zuikaku was in WW2 because, the Japanese needed the ship. The ship was a very important one because, it was an aircraft carrier so, it was definitely needed during the attack on Pearl Harbor.
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Japanese aircraft carrier Unyō was created on 1942-05-31.
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Japanese aircraft carrier Hiryū was created on 1939-07-05.
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Japanese aircraft carrier Shinano was created on 1944-11-19.