"My son liked to play with a fire-fighter's helmet" and "It was the fire-fighters' opinion that the fire could be put out" (several of them) and "it was the fire-fighter's opinion that the fire could be put out" (just one with an opinion).
Use the apostrophe right after the letter s: fighters'
Water and foam
Fire fighters use mostly arithmetic, but some algebra too.
CO2
The Fire Fighters Museum was created in 1904.
Here is an example: Fire fighters face many hazards. Explosions, fire, toxic inhalations, etc. The cumulative risk of being a fire fighters is immense.
The duration of Fire Fighters - film - is 1200.0 seconds.
Fire Fighters - film - was created on 1922-10-08.
International Association of Fire Fighters was created in 1918.
Yes, Helicopters have radios similar to what police and fire fighters use.
The high winds hindered the fire fighters in their efforts to put out the blaze.
Tom Swift Among the Fire Fighters was created in 1921.