Admiral Isoroku Yamamoto attended Harvard University where he gained a good understanding of American culture and developed an avid interest in the game of poker. Yamamoto played his cards when he outlined a plan to attack Pearl Harbor in January 1941. In April the Japanese organized a First Air Fleet with Vice Admiral Nagumo as its Commander in Chief. Commander Minoru Genda was appointed air staff officer, and because Nagumo was unfamiliar with air tactics,  Genda was given responsibility for planning the attack on Pearl Harbor. Cdr. Genda immediately began perfecting the Pearl Harbor plan, and few details were overlooked. The Imperial Navy's First Air Fleet consisted of six carriers. The Akagi, flagship of the strike force, was a converted cruiser which carried 63 aircraft. The Kaga also carried 63 aircraft, and was a converted battleship. The Soryu was the first carrier built from the ground up and was similar to the Hiryu. Each carrier had a compliment of 54 aircraft. With two additional carriers, the Zuikaku and the Shokaku,  the fleet had a total of 378 aircraft. Three different types of aircraft were utilized for the attack. Mitsubishi A6M2 "Zeros," a highly maneuverable single seat fighter, was responsible for obtaining air control and for strafing aircraft and ground installations. Aichi D3A1 "Vals," with two-man crews, were utilized for dive bombing. Nakajima B5N2 "Kates" were responsible for horizontal bombing and torpedo bombing. The Kate carried a crew of three and had a cruising speed of only 160 MPH. During the first wave of the attack 183 aircraft were deployed. Torpedo aircraft from the Akagi, the Hiryu, and the Kaga targeted battleship row during this first wave. As portrayed in Stan Stokes' life-like painting, a Japanese Kate from the Akagi launches its torpedo from very low altitude. Not far in the distance looms the USS West Virginia and Tennessee, virtual sitting ducks. The Japanese had trained carefully, and had modified their Kai Model 2 torpedoes to accommodate the shallow waters of Pearl Harbor. While caught by surprise, the USN was fortunate that its carriers were not in port, and that the Japanese had failed to destroy many of the support and repair facilities. This stroke of good luck permitted the USN to repair many of the ships damaged in the attack quite quickly. The devastating blow Yamamoto had planned for December 7, 1941 backfired by infuriating American public opinion, and eventually lead to Imperial Japan's defeat and unconditional surrender.