The data entry endpoints in a 911 dispatch center should not be running a general purpose consumer OS. They should be single purpose machines much closer to a dumb VT100 terminal than a personal computer. Maybe something like a stripped down hardened Chromebook. No internet connection. No personal email, web, or other use allowed or even possible. A product like crowdstrike should not be needed because it should not be possible to run anything but the dispatching software on those machines.
That's what computer aided dispatch (CAD, in the industry) software was 30 years ago (my PSAP had an AS/400). The market has rejected it. Also, see my other comment re: FBI CJIS policy.
In the PSAP I support we have three dedicated PCs at each workstation to run the CAD, phones, and radio. Each of those has a dedicated VLAN, separate physical servers and storage, separate Active Directory forest for CAD (no AD for radios or phones-- standalone PCs), and default-deny ACLs for inbound and outbound traffic on the hosts and at the borders.
A fourth dedicated PC (VLAN, ACLs, physical servers, AD environment) does email, web browsing, etc. (All of it is shackled together with a nice KVM that supports a single keyboard and mouse controlling up to 5 PCs.)
Not every PSAP does this and I think that's insane. The law and fire agencies we interface with absolutely do put a single PC on a desk (or in a cruiser) and use it for everything (and we filter and monitor the traffic coming in from them over our VPN heavily and block access at the first sign of anomalous traffic). Often their budgets don't support the notion of using dedicated computers for task-oriented work. The marketers have pushed general purpose devices for this kind of application.
In the last 5 years all three "hardened" systems we use (all companies acquired by Motorola) have started requiring Internet access for various APIs they use, and for integration with third-party vendors (mapping, public information databases, and task instructions for telecommunications). I think it's ridiculous, but I don't get to decide the direction of the product roadmaps or what the business stakeholders want from a feature perspective.
Motorola (who makes the CAD software used by some of the largest US municipalities) is pushing for hosted CAD and integrating hosted features into on-prem systems. (Of course, they have a managed security product offering that they want to sell along side it.)