Not the Liberty stuff, which is interesting enough, but the red cab right rear which is even rarer. It is a late 1930s Metropolitan or Montpelier contractor-built hard cab COE conversion, probably a 1939 1.5 ton Dodge.
These were made in small numbers, but sold well enough for Dodge to tool up for a cabover version of their own new 1939 cab in the 1940 model year and with slight changes from 41 to 47, same as the Ashby collection WK60 Breakdowns.
As far as I know the only military use of the cab type was on one of the sixteen VC military prototypes, the cabover ambulance, from late 1939, though I think the ambulance was Montpelier and the red one is Metropolitan;