Several years ago I was at AFSPACOM... We did a study on comm/data points of failure. The Nashville site was on the list among a number of others. One of the others was one building in St Louis, and was a single point of failure for East-West comms. That's the one that really worried us. A single bottle-neck to shut down commercial and military comms. At the time, SATCOM was not the answer, as all comms have to hit the ground at some point. Note this "was" - the issue may have been corrected.., (yeah, right).