I think Andy addressed the "liscensed likeness" situation some time back. Note carefully that the Limited Edition Sherman refers to "a general", I don't think the "P-word" is used, even though we all know who is depicted. I know that the Patton family is quite protective of GSPs image, I imagine some of the other families are too.
I agree that a "tank brigade major" and "his executive officer" would be interesting in the WW1 line as would a "colonel from the 42nd Division".
Gary