Link to Oklahoma's flowchart....seems it's needed if over 26K UNLESS it is for recreational use. See the note at the bottom. http://www.dps.state.ok.us/ohp/needcdl.pdf
But in line with the topic, a M900 series in normal config is less than 20K. So depending on the computation of the GVWR, no CDL would be required.
There is also a list of exemptions at the bottom. We should now debate the term 'Military Vehicles'. I shall start. I interpret this to mean vehicles operated by the military.
I was positive the next response would be a link to the Goole search page.