More info on the CAF Museum can be found at their website: http://www.cafmn.org/
MNCAF blog with a few more photos of Miss Mitchell: http://minnesotawingblog.blogspot.com/
From what I could reference, this is a 1942 Ford Staff car for the US Army. Essentially it is a 1942 Ford Sedan with a military paint job and a few other customizations done too it. Shape wise, very similar to the 1941, but the front grill is much different between the two years.