The example shown here in the "weeds" was one of two of the type operated by a pilot school run by William H. Engle and trading as Silver Star Aircraft Service. (Note: Fairchild took over the Challenger series and retroactively gave the model number KR-31 to the C-2, despite not building any.)
This photo was added on 11 May 2024, and has since been viewed 243 times.