There is an emergency services/DHEC Drill in Spartanburg today (5/18). Voice ops among DHEC and local hospitals (SRMC and Mary Black) are on 45392.
Additional EMS ops are on EMS 2 48656, Ops 48496, County Fire 1 154.310/85.4 and County Fire 2 154.025/85.4.
800MHz conventional ITAC and SC TAC frequencies are also in use for on-scene comms.
It's being referred to as "Drill 2005" on the radio.
Maybe that's related to what you heard.
Brian