By radio, screaming really loud and hand signals (all depends on what kind of operation their involved in)
The plural of fireman is firemen. If you want to use inclusive language, then you can say firefighter and firefighters.
With dedication and teamwork, we were able to win the championship.
Cambria
Firefighters must co-operate with each other on the emergency scenes. Whether it be a House Fire, Vehicle Accident, Medical Emergency, or any other scene, co-operation is extremely important. Firefighters will have to stay in teams of, at least, two firefighters while entering a burning building, which requires trust in the other persons that they are working with. They must cooperate while extricating patients from a wrecked vehicle, also. This is because not only 1 person can do the job.
The personal pronoun that takes the place of the plural noun 'firefighters' is they as a subject and them as an object.example: The firefighters use this facility for training. When they damage it, a local contractor repairs it for them at no charge.
They don't have to be beige/khaki. Many departments use black, and some even use red!
By hunting together.
firefighters use water because when water touches something it cools down
water is the most practical thing to use
There is no standard collective noun for firefighters, in which case a noun that suits the situation can be used; for example a crew of firefighters, a squadron of firefighters, a team of firefighters, etc.
My Scout troop often demonstrated our sense of teamwork in the community by cleaning up vacant lots.
Teamwork tactics