Concerning war plans to invade Greenland, I remember a big commotion concerning plans to invade Canada. The Canadian plans were simply developed as an exercise at a US military command and staff college or National Defense University.
Heck, what better way to develop strategic thinking among field or flag grade officers than to assign a project of developing plans to invade and occupy country X, Y, or Z. That stated, why wouldn’t the US Army, Army, Navy, and Air Force have combined plans for each and every country on earth? Even my Marine Corps University would certainly develop such plans.
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@Red Leg , would you be so kind as to enlighten this equipment junkie officer as to training my seniors would have participated in?
At the war colleges, different "scenarios" based on real world areas are used, but the scenarios revolve around either an insurrection where we are assisting an ally, or sometimes in response for humanitarian assistance or disaster response. Of course all materials are marked "EXERCISE EXERCISE EXERCISE"
The idea is not to figure out how to "invade" a place, but operationally, determine how to plan with the limitations of space, time, and forces available.
When I was at the Naval War College, if memory serves, there was a scenario in Borneo. Funny story there was the guy who took the book home with him for a long weekend... and then left it in the seat pocket of the airplane he used for travel. I bet someone in the world picked up the manual and thought we were planning something there.
When I attended the Advanced Logistics Officer Course at the Marine Corps University (in 2003) we had a scenario in north Africa. One of the limitations there concerned the local railroad, necessary to move the force from the Med further south. The problem was the railroad in question was a narrow gauge railroad, limiting the size and weight of equipment for movement. This led to a hilarious conversation between the briefer (a Reservist Major) and the hired "Graybeard" mentor: a retired General Officer. The GO was playing the role of the Commander.
Briefer: Sir, the only railroad available is narrow gauge, which means it cannot be used to move any of our tracked vehicles or heavy equipment, including our AVLBs [Armored Vehicle Launched Bridge] or our D-7 bulldozers.
GO: How do you know this? Are you just assuming?
Briefer: No sir. This is a fact. I am a Reservist, and I know about the capabilities of narrow gauged railroads because in my civilian job, I am an engineer for Union Pacific Railroad.
GO: Does this mean you build or design railroads?
Briefer: No sir, I'm an engineer. I drive the choo-choo.
GO (After a pregnant pause, where he realizes not only are there at least two definitions of the word "engineer" but also that the Briefer has probably forgotten more about rail operations than any of us will ever know): "Don't give me that action-officer BS. Next slide!"
OK, so I guess you had to be there.