USMC Divisions in World War III

So, a RAND study on the (sideshow) southern theater of World War III included this graph.

Notice how low the USMC divisions are placed. Even the WP bottom-of-the-barrel Romanians outdo them. I have my quibbles with this kind of “Battle of the spreadsheets” system, but a look at the USMC’s force structure, especially at the time shows that they were not suited for this kind of mobile continental war.