He traveled to the Panama Canal Zone in January 1923 to report on the state of the defenses there. After he returned, he was assigned to the Joint Army and Navy Planning Committee, an organ of the Joint Army and Navy Board responsible for coordinating war plans between the two services. 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.[16] Krueger considered the problems of inter-service cooperation.