I feel like I misunderstood something here. I presume the police/firefighters were needed to live near the community because they might need to respond in an emergency. Or possibly for community relations for the police (I know some jurisdictions require you to live in the community you police, at least in the states). If I'm wrong in this assumption, please correct me and supply some more context.
It's not automatically clear why the situation you've laid out includes the additional groups you've listed.