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While with the Joint Planning Committee, he worked on War Plan Orange, the plan for a war with Japan, and War Plan Tan, for a war with Cuba. Krueger considered the problems of inter-service cooperation. At his own request, he attended the Naval War College at Newport, Rhode Island, in 1925 and 1926. He continued to ruminate on the nature of command. "Doctrine", he wrote, "knits all the parts of the military force together in intellectual bonds."