English: Joint Army and Navy Basic War Plan Red, also known as the Atlantic Strategic War Plan, was a plan for the United States to make war with the British Empire (the "Red" forces). It was developed by the United States Army following the 1927 Geneva Naval Conference; and approved in May 1930 by the Secretary of War and the Secretary of Navy and updated in 1934–35. In 1939 it was decided that further planning was no longer applicable but that the plan be retained.

Canada (Crimson), Great Britain, Northern Ireland and Newfoundland (Red), British Raj (Ruby), Australia (Scarlet), New Zealand (Garnet), Ireland - by that time no longer part of the British Empire (Emerald), and other parts of the British Empire (Pink-not part of the plan), United States (Blue).