Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Imperial Japanese Navy of World War II was the second most powerful navy in the Pacific War in World War II. It was the third largest navy in the world. During the first years of the war the Imperial Japanese Navy dominated the Western Pacific. However, after a series of defeats it lost control of the Western Pacific and collapsed by the end of the war. It was controlled by the Imperial Japanese Navy General Staff and the Navy Ministry. The naval air service was one of the most potent air forces in the world before its destruction in World War II.