My son-in-law is a cop, and I used to work as a fireman. It's an amicable rivalry. Cops despise dealing with fires, and firemen are relieved to see cops on the scene. Crowd and traffic cops are often called to a fire scene to regulate crowds and traffic so that the firemen are not inconvenienced. Cops and firemen live and die by each other. If a fireman gets hurt on the job, then a cop can step in and take his place. The same thing goes for cops. If a firefighter gets sick or has an injury that keeps him/her off the job, then another firefighter has to fill in. There are also ambulance drivers who are also trained to fight fires. They're called paramedic officers or paramedics. These men and women go through extensive training with medical equipment designed specifically for first responders like police officers and firefighters. In addition to being trained to fight fires, paramedics are trained to treat injuries related to accidents on the road. They may treat people who have been hit by cars or trucks; they may treat people who have been involved in collisions with animals such as horses. Finally, there are canine units that contain dogs trained to detect drugs, bombs, and even human remains. These dogs are also taught to avoid getting injured while on duty. When deployed at a crime scene, canines will usually stay with their handlers. They don't work alone like some police officers do.