C-23B+
The SD-360 conversion to C-23B+'s was a politically driven Pork Barrel project, utilizing high time & high cycle airframes converted to twin tailed ramp equipped Sherpas.
They continue to fly. Now "given" to the US Forest Service to replace more capable airplanes like the Turbine DC-3 and DHC-6.
This event has been written about on a fire related aviation site.
It is also replacing the C-23A Sherpa that the USFS got from the USAF back in the fall of 1991. Neither airplane has good performance in high altitude and hot temperature situations which includes most of the area of operation of the USFS. Interestingly the A models currently have fewer hours and cycles than the B+'s.
I agree with the previous post that the airplane carries a lot of ice but not very good. In my case it was a C-23A.