It is only called "Blitz" in Australia.
"Blitz" was a popular name early on in the war, when many agile vehicles were called "biltz buggy", incl.
(what was later known as) the jeep and a
cut-down Canadian built Ford C11ADF used by the LRDG.
After WW2 there even was the
Blitz Buggy company which made fire appliances.
Over to the Australian members to come up with the earliest documented reference to Blitz for CMP trucks
Source:
https://commons.wikimedia.org/wiki/C...ter_collection