Because part of the old K25 site has been made a National Park, I would be more willing to believe Y12 threw the new Rangers, was housed at AMSE, a couple of older radios, than I would GSMNP or other park Ranger types being given a TG on their system.
Lightning is a major major issue at Y12, as is high winds, you'll hear both coming from the PSS (Plant Shift Superintendents') Office.
In addition to ETTP, Y12, and ORNL, townsite and a couple of other entities are on that system, now.
If we are voting on names, DOE ORO (Oak Ridge Operations) makes sense to me. Not everything is NNSA out there, and there are places off the main reservation where communications take place.