The callouts can be directed towards crimes done by gangs and heavily armored criminals. You rely on the AI to drive you to the destination, or you can drive the van loaded with other swat units. You try to defuse the situation with that Activation Button thing you can do as a police officer, it can have some RNG to control the outcome. If it fails you have to kill the targets. Optional: You can play as a commander too, or what those are called. Where you are the one with the strategies, the one who call the ambulance, helicopters and so on.