Drove into a "receinvg zone" for PG and listened at bit... it seems that:
2001 / FedEx 1 is Police/Secuity/Traffic (outside the stadium)
2003 / FedEx 2 is Field/Internal Ops (inside)
2005 / FedEx 3 is Fire/EMS
I don't think I noticed FedEx 4-6 (2007/2009/2011) at all today so at this point I don't think they are really being used for FedEx / Redskins games. I notice alot of usage of FedEx talkgroups during the week for non-game activity....