The simple answer is, yes, in most states. An employer can prohibit an employee from carrying a firearm on duty and regulate the type of weapons that an employee can possess at work, the type of ammunition that is carried and related issues.
Can a firefighter have a gun?
Fourteen firefighters for every fire regional office and city station will be authorized to carry a firearm as members of the security and protection unit.
Do firefighters carry weapons?
The law currently only allows law enforcement officers to carry firearms at emergency scenes. ... Effective July 1, 2016, EMTs and firefighters can now carry firearms on the job.