You could be right: I hadn't heard of Force Recon before (I stopped reading Clancy after Rainbow Six), and might well have misheard.
Anyway, both exist. First Recon is the First Reconnaissance Battalion (http://en.wikipedia.org/wiki/1st_Reconnaissance_Battalion). One company of First Recon is part of Force Reconnaissance (http://en.wikipedia.org/wiki/Force_Reconnaissance), who also have a company attached to Second Recon. But it looks like they're moving to a new force structure which will unify Force Recon under a Special Operations Command. First Recon appear to be fairly elite and crack, but less so than Force Recon. Or something, I don't really have time to read the half-dozen Wikipedia pages concerned right now :-)
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Anyway, both exist. First Recon is the First Reconnaissance Battalion (http://en.wikipedia.org/wiki/1st_Reconnaissance_Battalion). One company of First Recon is part of Force Reconnaissance (http://en.wikipedia.org/wiki/Force_Reconnaissance), who also have a company attached to Second Recon. But it looks like they're moving to a new force structure which will unify Force Recon under a Special Operations Command. First Recon appear to be fairly elite and crack, but less so than Force Recon. Or something, I don't really have time to read the half-dozen Wikipedia pages concerned right now :-)