 Complete the following phrase:  During the first six months of the war Japanese naval air power achieved spectacular success and spearheaded offensive operations against Allied forces. On 7 December 1941, the IJNs Kido Butai attacked Pearl Harbor, crippling the U.S Pacific Fleet by destroying over 188 aircraft at the cost of 29 aircraft. On 10 December, Japanese naval land based bombers operating from bases in Indochina, were also responsible for the 