Pearl Harbor beyond one doctrine

Kantai Kessen shaped Japanese cruiser and naval-aviation development, but it was never the whole of Imperial Japanese doctrine. The attack also emerged from rivalry between the army and navy, along with shifting alliances among factions inside both services. That institutional competition matters because Japan was an island empire whose resources and communications depended on sea transport. Pearl Harbor therefore needs to be understood as the product of several interacting doctrines and political coalitions rather than one timeless plan.