Chūichi Nagumo
The Kidō Butai (機動部隊, "Mobile Unit/Force") was the Combined Fleet's tactical designation for its combined carrier battle groups. The title was used as a term of convenience; it was not a formal name for the organization. It consisted of Japan's six largest carriers, carrying the 1st Air Fleet. This mobile task force was created for executing the attack on Pearl Harbor under Vice-Admiral Chūichi Nagumo in 1941. For the attack on Pearl Harbor, the "Kidō Butai" consisted of six aircraft carriers (commanded by Chūichi Nagumo, Tamon Yamaguchi and Chūichi Hara) with 414 airplanes, two battleships, three cruisers, nine destroyers, eight tankers, 23 submarines, and four midget submarines. However, these escort ships were borrowed from other fleets and squadrons. It was considered the single most powerful naval fleet until four of the six aircraft carriers of the unit were destroyed in the disastrous Battle of Midway.