I could imagine that this might be helpful to convince a boss or a colleague that git is not some obscure hacker tool ("Look, even NASA uses it").
Some NASA centers in certain departments mandate the use of certain technologies, for instance .NET and sourcesafe.
I worked on some internal projects at NASA and used git though. A buddy of mine at USGS uses git for all of his work.
hearing/confirming that nasa uses git internally for all of their mission-critical code would be something different.
While I don't necessary like the way how people in our industry tried to infuse new technology to their working place, someone has to do it somehow and I suppose this is the shortest way to convince upper-level: pick a famous company/corporate/organization as an example instead base on needs.