United States
British Empire
War Plan Red, also known as the Atlantic Strategic War Plan, was one of the color-coded war plans created by the United States Department of War during the interwar period of 1919–1939, covering scenarios related to a hypothetical war with the British Empire (the "Red" forces, likely in reference to the Red Ensign). Many different war plans were prepared by mid-level officers primarily as training exercises in how to calculate the logistical and manpower require...
