The “Rainbow Plans” were for fighting every nation on earth.
I am aware of that. It was not one plan, but a series of plans.
And they got the name because they used different colors for each potential enemy.
Green was for a possible US-Mexico war.
Grey and Purple were for various levels of conflict in Latin America and the Caribbean.
Black was for another war with Germany.
White was for a domestic war.
Brown was for a conflict in the Philippines.
Red was for a war against the UK. With other plans for Canada (Crimson), Emerald (Ireland), and Australia (Scarlet).
Yellow was for a war in China.
Gold was for France and her colonies.
And War Plan Orange was for a war against Japan. The earliest draft was made as early as 1923, a huge chunk of it based on Operational Plan 712 in 1921 by Marine Major Earl Ellis. And if anybody wants to read his actual writings, it is not hard.
'Advanced Base Operations in Micronesia' -- the seminal study by Major Earl H. Ellis
www.ibiblio.org
Remember, this was first published in 1921. It predicted tactics and equipment that did not even exist yet, talked about Japans history of conducting attacks as they declare war, and expected a major target would be Hawaii and the Philippines. And that to take the war against them an "island hopping" campaign would have to be conducted pushing farther West each time. And that was in 1921. And hw wrote many articles in the "Marine Corps Gazette", the professional magazine for Navy and Marine Officers (equivalent of "Leatherneck" for enlisted, and "Proceedings" for Naval Officers) warning that Japan was the biggest threat in the Pacific for the US.
I first read a lot of his earlier works back in 1986 when I had to do a large report and picked him as the subject.
Most of Rainbow came from the drafts Major Ellis made regarding future war in the Pacific against Japan. And when war broke out, the Navy and Marines followed War Plan Orange because they had been refining it for over 20 years by that point.
He was already recognized even then for his ability to plan operations, and also to lead them. Not many Captains and Majors win the Distinguished Service Cross, Navy Cross, Silver Star, and French Croix he Guerre with Gold Star all within a six months. But many now attribute him as acquiring PTSD in Europe (particularly after the Muse-Argonne Offensive) with his drinking problem, which is what most believe ultimately killed him.