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I'm listening to TG653 on the Ft Detrick system trying to ID what it's a patch of.
It sounds like units are working a fire type incident. I've heard Chief-22, Chief-11, Quint-11, Truck-1 and Tanker-1.

What channel are they on?

1903- Got it narrowed down to Frederick Co.
Tac40? Would that be the first assigned channel for a working incident?