These two caught my attention:
(1) The Holt 150 ton 'Field Monitor' was "A paper project only, it was projected to be built in 1916. It was first envisaged that the Field Monitor would be used in Mexico, ranging across its great plains and deserts in search of the vigilante forces raiding into America. ‘Black’ Jack Pershing put a stop to this idea; he did not hold motorized vehicles in high regard, except for their role as support vehicles."
(2) The 1919 Medium Bs missed WW1 but caught action in Russia. "All production were machine gun armed but there was a design for a Male version mounting a long 6 pounder (57mm) gun in a fixed superstructure."
As Ever,
Oz
(1) The Holt 150 ton 'Field Monitor' was "A paper project only, it was projected to be built in 1916. It was first envisaged that the Field Monitor would be used in Mexico, ranging across its great plains and deserts in search of the vigilante forces raiding into America. ‘Black’ Jack Pershing put a stop to this idea; he did not hold motorized vehicles in high regard, except for their role as support vehicles."
(2) The 1919 Medium Bs missed WW1 but caught action in Russia. "All production were machine gun armed but there was a design for a Male version mounting a long 6 pounder (57mm) gun in a fixed superstructure."
As Ever,
Oz