Linux Journal takes a look at Fermi Linux.
"Fermilab supports its own users and directs others toward Scientific Linux, which was codeveloped by Fermilab, CERN and other laboratories and universities.
Troy Dawson is the primary contact for both Fermi Linux and Scientific Linux. On his own site, he explains, "Fermilab uses what is called Fermi Linux.
It is now based on Scientific Linux. It is actually a site modification, so technically it is Scientific Linux Fermi.