It sure is. It's been down for hours. http://www.isitdownrightnow.com/nsa.gov.html Funny thing is, outages for GitHub and its ilk hit HN in minutes. Either way, the transparency in the post-mortem is more valuable and telling than the outage. Organizations need to prove themselves with transparency to build and earn trust. Yet, one of these things is not like the other.
The public nsa.gov site is just another government website. It's not like they're running it out of one of their secret data centers.
a) it is the NSA and
b) it is a "marketing" website
I'm not sure what utility www.nsa.gov provides beyond a mission statement. Never was curious before, now I am. :)
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edit: clarity