25C = "25 Cities Interoperability Project", High Risk Metropolitan Area Interoperability 25 Cities Project (managed by the FBI)
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STL CALL 171.43750 (VHF P25 Voted System)
8CALL90                     (800 MHz Simulcast Voted Repeater System) (in use)
STL TAC   171.68750 (VHF P25 Voted System) (Confirmed in use Encrypted 7/17/12) (NOT always encrypted) See WIKI for more info
8TAC91                       (800 MHz Simulcast Voted Repeater System)
**All of the above repeaters can be networked together.

*Arrowhead appears to be a Net Control/Dispatcher (National Park Service....arrowhead shape represents historical and archaeological treasures.)
Roll calls include: ATF, CBP (Customs), DEA, FBI, TSA; St. Louis City, St. Peters City, St. Charles County, St. Louis Metro Public Safety, St. Clair County,  St. Louis County Police, St. Louis County EOC, Mail Services