There is a valid STA for a "large spectator event" in Ft Smith, WRXA675, operating on DMR in the 451 and 462 MHz bands, it expires June 23rd. Being a STA (Special Temporary Authorization) it is doubtful the LCNs are known unless someone monitored the event. If this is the system you are talking about, you probably won't hear it much longer.
There may be other systems in the area belonging to Bearcom, but the FCC database is down and this was the only one I could find.
FCC Callsign WRXA675 (BearCom Operating)
www.radioreference.com