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The key elements in Yamamoto's plans were meticulous preparation, the achievement of surprise, and the use of aircraft carriers and naval aviation on an unprecedented scale. In the spring of 1941, Japanese carrier pilots began training in the special tactics called for by the Pearl Harbor attack plan.

The key elements in Yamamoto's plans were meticulous preparation, the achievement of surprise, and the use of aircraft carriers and naval aviation on an unprecedented scale. In the spring of 1941, Japanese carrier pilots began training in the special tactics called for by the Pearl Harbor attack plan.

 

In October 1941 the naval general staff gave final approval to Yamamoto's plan, which called for the formation of an attack force commanded by Vice Admiral [[Chuichi Nagumo]]. It centered around six heavy aircraft carriers accompanied by 24 supporting vessels. A separate group of submarines was to sink any American warships which escaped the Japanese carrier force.

In October 1941 the naval general staff gave final approval to Yamamoto's plan, which called for the formation of an attack force commanded by Vice Admiral [[Chuichi Nagumo]]. It centered around six heavy aircraft carriers accompanied by 24 supporting vessels. A separate group of submarines was to sink any American warships which escaped the Japanese carrier force.