Are the Chicago Fire cast real firefighters?

Related questions

1. Is Chicago Fire filmed in a real firehouse?
2. What caused the Chicago Fire in 1871?
3. How did DuShon Monique Brown from Chicago Fire Die?
4. Does Sylvie die in Chicago fire?
5. Did the cow die in the Chicago Fire?
6. Is Dawson leaving Chicago Fire?
7. Why did Charlie leave Chicago Fire?
8. Will there be a Chicago Fire Season 8?
9. How did the Chicago Fire affect Chicago?
10. Did Reese leave Chicago Med?

Tags

1. #chicago
2. #rescue
3. #casey
4. #again
5. #christopher
6. #matthew
7. #firefighters
8. #eigenberg
9. #david
10. #spencer
11. #jesse
12. #minoso
13. #herrmann