Here is the only C-79 in the USAAF inventory (as far as I know)
The model is the old Airfix Junkers Ju52 with new engines from Flightpath and propellers from the new Airfix C-47.
As the engines were made for the DC-2/DC-3 they had to be modified to fit the Ju52.
It had flown for a couple of South American airlines before being confiscated by Peruvian government in 1941.
It was later acquired by the USAAF as war prize and got new engines, instruments and radio among other changes.
It was used in the Panama Canal Zone, in service with the USAAF 20th Transportation Squadron, Sixth Air Force.