I found this webpage[0] (and those it links to) to be a good bit of context on what this all means. (And then ran off to do a bunch more searching!)
tl;dr: CMS (Compact Muon Solenoid) is one of two major detectors of the Large Hadron collider. Fermilab was intimately involved in designing CMS. Fermilab is also a "tier 1" computation center for processing LHC data (possibly restricted to CMS data?). Per this factsheet[1], there is one other "tier 1" compute farm in the US, though it isn't named in particular. I'd guess Lawrence Livermore, but I have nothing more than a hunch.
