Since it's illegal for any drones to operate over 4.9 Ghz range, and that's what the first responders are transitioning to,
Just for the sake of accuracy, I feel it necessary to point out that most (certainly not all) public safety is transitioning to 700 and 800 MHz radio systems if they are not there already. These agencies are generally located in urban and suburban areas.
Most wildland fire radio traffic occurs on HF and VHF frequencies, in the neighborhood of 30 MHz and 150 MHz, respectively.
No public safety agency operates voice communication on 4.9 GHz, although there can be microwave back-haul links and systems associated with public safety radio systems operating there.
Much of the traffic on HF and VHF associated with wildland fire operations is simplex, and a mess at 4.9 GHz would have no appreciable affect on those communications. So yeah, jam away.