1. Its close to impossible to fire a civil servant.
2. Believe it or not some civil servants actually do an outstanding job.
The GS people are close to impossible to manage. They have their own set of regulation and rules. I worked with a GS-17 (long long ago and far far away) when I was in the military. My memory isn't great but somewhere in the mists of memory in order to get a GS-17 grade you have to be approved by Congress.
The other GS-12's & 13's I worked with were super sharp. I worked with them while in Germany and most of them came from France when the French kicked the US bases out (now that was a long time ago). They were exempted (if memory serves me) from having to go back to the states. Normally they have 3-4 years(?) limit. Most of the long timers married locals and of course some didn't. In all my dealings with GS types I have only run across a few that were well average. I still keep in touch after 40 years.
I have not worked with any stateside GS's but from my poor memory only the cream got to go overseas with the military.
I was not too surprised about the number of data centers "hidden". The problem with the discussion they did not define what a data center was. So theoretically 1 server could be considered a data center it is impossible to tell. So any numbers that were derived have to be sifted through to figure out what is the true number.