I saw this airplane at Oshkosh some years ago (possibly in 2017 or 2018) and it was on it’s last legs then. The crew said they didn’t fly it any more than necessary because it was becoming so difficult to support from a maintenance/parts perspective. Also, they only had two pilots who were qualified to fly it. Every year, each pilot would (in turn) “check out” the other pilot for currency. No matter how good an airplane, any last-of-breed is a challenge to operate for any meaningful purpose.
For the communications support mission, you’d think NASA has a King Air or two sitting around somewhere that could easily be put into that use.