Half track
I've just interviewed Mike Cecil on that very subject for the upcoming Carrier DVD, although not in complete detail...
The CMP half track was one of several experiments to create a specialised vehicle for beach transport during landings in the island campaigns. Other vehicles used were Ford/MH and International Harvester.
It used adapted Carrier bogies and tracks with a Chev differential, but after trials was abandoned because of relatively slow road speed, noise and the unsuitability of steel tracks on hard road surfaces, and at any rate the US-built half tracks with their rubber tracks and more powerful engines were becoming more available in the area so the CMP and other indiginous half-tracks were abandoned.
Not sure of the date but it has steel doors rather than the canvas covered lightweight doors which would indicate 43 or early 44.
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