NSA Secure Linux

Sorry if this has been discussed, but I was wondering if anyone had heard
about the NSA's new "SeLinux," which I guess stands for "Secure Linux." It
is not another distribution. Rather, it is a module type thing.
http://www.nsa.gov/selinux/

Has anyone installed this. I want to try it, but I don't want to mess up my
kernel. I would rather someone else be the guinea pig.

I would be curious as to who is the first person to assert that SeLinux is
teeming with backdoors?