If you're targeting first responders, you could approach private ones first (festival, big event, fairs, etc..). They have basically the same needs as the publi

If you're targeting first responders, you could approach private ones first (festival, big event, fairs, etc..). They have basically the same needs as the public ones, but their operation theatre is sometimes/often a private one (private property) with a lot less regulatory overhead. Obligatory IANAL here, but (not US) event organiser.