What is the ruling on Muslim firefighters fasting in Ramadan, given that they must drink large quantities of water during their work to avoid heat exhaustion?

The issue states that it is permissible for workers in arduous professions to break their fast during Ramadan (definition) daylight hours if they are in need of their work, there is no one to replace them, and they fear harm if they do not break their fast. They must make up the missed days. Analogous to the nursing mother is one who breaks their fast to save someone on the brink of perishing; they must break their fast if they cannot rescue them otherwise. Similarly, it is permissible to break the fast for one who is fighting an enemy, or if the enemy has surrounded their land and fasting would weaken them from fighting.